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Subordinating Conjunctions in English: Grammar and Exercises

Subordinating conjunctions are essential parts of English grammar. They connect dependent clauses to independent clauses and show relationships such as cause, condition, time, contrast, purpose, and place. Common examples include because, although, if, when, and unless. Understanding subordinating conjunctions can help learners construct complex sentences, express ideas more clearly, and improve their writing and speaking skills.

This guide explains what subordinating conjunctions are, explores their main types, provides practical examples, highlights common grammatical mistakes, and includes exercises with answers to help you review what you have learned.

What Are Subordinating Conjunctions?

Subordinating conjunctions are words or expressions that introduce dependent clauses and connect them to independent clauses. They establish a grammatical relationship between two clauses and explain how their meanings relate to each other.

An independent clause can express a complete thought and stand alone as a sentence. A dependent clause, however, usually cannot function as a complete sentence by itself because it relies on another clause to complete its meaning.

For example:

I stayed at home because it was raining.

In this sentence:

• I stayed at home is the independent clause because it expresses a complete thought.
• Because it was raining is the dependent clause because it explains the reason for staying home.
• Because is the subordinating conjunction that introduces the reason.

Other common subordinating conjunctions include although, if, when, while, before, after, until, so that, wherever, and whereas.

Sentence Structures with Subordinating Conjunctions

There are two common ways to arrange clauses when using subordinating conjunctions.

Structure 1: Independent Clause + Subordinating Conjunction + Dependent Clause

Formula:

Subject + Verb + Subordinating Conjunction + Subject + Verb

Example:

She stayed home because she felt unwell.

The independent clause comes first, followed by the dependent clause. A comma is generally unnecessary when the dependent clause follows the independent clause.

Structure 2: Subordinating Conjunction + Dependent Clause, Independent Clause

Formula:

Subordinating Conjunction + Subject + Verb, Subject + Verb

Example:

Because she felt unwell, she stayed home.

When the dependent clause appears at the beginning of the sentence, a comma usually separates it from the independent clause.

Understanding these two structures is an important first step toward using subordinating conjunctions correctly in both spoken and written English.

Types of Subordinating Conjunctions in English

Subordinating conjunctions can be grouped according to the relationships they express. Learning them by function makes it easier to remember their meanings and choose the appropriate conjunction for different situations.

Subordinating Conjunctions of Cause and Reason

Conjunctions such as because, since, and as introduce clauses that explain why something happens.

• Because: Introduces a reason, often when the speaker wants to emphasize the explanation.
• Since: Means “because” and is often used when the reason is already known or is not the main focus.
• As: Can also mean “because,” particularly when the reason is background information.

Examples:

I couldn’t attend the meeting because I was sick.

Since everyone is here, let’s begin.

As the roads were crowded, we arrived late.

These conjunctions can express similar meanings, but they are not always interchangeable in every context. Consider the intended emphasis, sentence structure, and natural flow when choosing one.

Subordinating Conjunctions of Condition

Conditional subordinating conjunctions introduce a condition that must be met for something to happen.

Examples:

If you study regularly, you will make progress.

You won’t understand the lesson unless you ask questions.

In the second example, unless has a meaning similar to if…not:

You won’t understand the lesson if you don’t ask questions.

Because unless already introduces a negative condition in this context, adding not to the same clause is generally unnecessary and may change the intended meaning.

In the first conditional, the if-clause commonly uses the present simple, while the main clause may use will to describe a possible future result.

For example:

If it rains tomorrow, we will stay indoors.

The present simple rains is used in the conditional clause rather than will rain.

Subordinating Conjunctions of Time

Time-related subordinating conjunctions explain when an event occurs, how long it continues, or the order in which events happen.

Examples:

When I arrived home, my father was cooking dinner.

While I was reading, my sister was listening to music.

Please finish your homework before you go out.

After she completed the report, she sent it to her manager.

We waited until the bus arrived.

Call me as soon as you get there.

One important grammar rule concerns future events. In time clauses introduced by when, before, after, until, and as soon as, the present simple is generally used to refer to the future.

Correct:

I will call you when I arrive.

Incorrect in standard usage:

I will call you when I will arrive.

Remember this rule when writing sentences about schedules, plans, and future actions.

Subordinating Conjunctions of Concession

Although, though, and even though introduce dependent clauses that express contrast or concession. They show that the information in one clause does not prevent the situation in the other clause from happening.

• Although: Means “despite the fact that.”
• Though: Has a similar meaning and is common in everyday English.
• Even though: Often places stronger emphasis on the contrast.

Examples:

Although it was cold, we went swimming.

Though he was tired, he continued working.

Even though she had little experience, she performed well.

Although these conjunctions share similar meanings, even though can emphasize a more unexpected contrast.

Avoid using although and but together to connect the same two clauses in a standard sentence structure.

Correct:

Although he was tired, he finished his assignment.

Alternatively:

He was tired, but he finished his assignment.

Both sentences are grammatically correct, but each uses a different conjunction pattern.

Subordinating Conjunctions of Purpose

So that and in order that introduce clauses explaining the purpose of an action.

Examples:

She spoke slowly so that everyone could understand her.

He left early in order that he could catch the first train.

In these sentences, the dependent clauses explain the intended outcomes of speaking slowly and leaving early.

So that is common in everyday communication and general writing. In order that can sound more formal and is less common in casual conversation.

These conjunctions often appear with modal verbs such as can, could, will, and would, depending on the intended meaning and time reference.

For example:

I am saving money so that I can buy a new laptop.

The clause so that I can buy a new laptop explains why the speaker is saving money.

Subordinating Conjunctions of Place

Where and wherever introduce dependent clauses that provide information about location.

Where refers to a particular place or the place in which something happens.

Example:

You can sit where you feel comfortable.

Wherever means “in any place that” and expresses a broader or unrestricted location.

Example:

Wherever you go, remember to stay safe.

In both sentences, the dependent clause explains the location associated with the action in the main clause.

Subordinating Conjunctions of Contrast

Whereas and, in some contexts, while introduce clauses that highlight differences between people, things, opinions, or situations.

Examples:

My sister prefers tea, whereas I enjoy coffee.

While some students prefer studying alone, others learn better in groups.

In these examples, the conjunctions emphasize contrasting preferences or learning habits rather than the timing of two actions.

Because while can express either time or contrast, its meaning should be interpreted according to the context of the sentence.

A Summary Table of Common Subordinating Conjunctions

The following table provides a quick reference to the main types of subordinating conjunctions in English.

Some grammar references classify more complex structures separately. For example, so…that is commonly associated with result clauses, while as…as belongs to comparative structures. These patterns should be studied according to their specific grammatical functions rather than treated as identical to all basic subordinating conjunctions.

Coordinating vs. Subordinating Conjunctions

Coordinating conjunctions and subordinating conjunctions both connect grammatical elements, but they establish different relationships between clauses.

Consider this example of a subordinating conjunction:

I stayed at home because I was sick.

The clause because I was sick explains the reason for the main clause and cannot normally stand alone as a complete sentence.

Now consider a coordinating conjunction:

I was tired, but I continued working.

Both I was tired and I continued working can function as independent clauses.

Recognizing whether two clauses have a dependent or equal relationship will help you select the correct conjunction and punctuate your sentences appropriately.

Common Mistakes When Using Subordinating Conjunctions

Understanding the meaning of each conjunction is not enough. You must also recognize the grammatical structure that follows it.

Confusing Because and Because Of

Because introduces a clause containing a subject and a verb. Because of is generally followed by a noun, noun phrase, or gerund phrase.

Correct:

We stayed home because it was raining.

We stayed home because of the heavy rain.

Incorrect in standard usage:

We stayed home because of it was raining.

To correct the last sentence, replace because of with because, or rewrite the following clause as a suitable noun phrase.

Confusing Although with Despite and In Spite Of

Although introduces a clause, while despite and in spite of are generally followed by a noun phrase, a noun, or a gerund phrase.

Correct:

Although she was tired, she kept studying.

Despite being tired, she kept studying.

In spite of her tiredness, she kept studying.

Avoid writing Despite she was tired in standard English. To retain the complete clause she was tired, use although instead.

Using Although and But Together

When although introduces a concessive clause, but is not needed to connect the same clauses in this structure.

Incorrect:

Although she was busy, but she helped me.

Correct:

Although she was busy, she helped me.

Alternatively:

She was busy, but she helped me.

Choose one structure according to the sentence you want to write.

Using Because and So Together

In a standard cause-and-result construction, avoid using because and so together to connect the same clauses in this way.

Incorrect:

Because I was hungry, so I made a sandwich.

Correct:

Because I was hungry, I made a sandwich.

Alternatively:

I was hungry, so I made a sandwich.

Both correct versions express the relationship between the cause and the result.

Using the Future Tense in Time Clauses

When the main clause refers to the future, a time clause introduced by when, before, after, or as soon as generally uses the present simple.

Correct:

I will text you as soon as I arrive.

Incorrect in standard usage:

I will text you as soon as I will arrive.

Remember that the main clause can use will, while the time clause normally uses the present simple to refer to a future event.

Tips for Learning Subordinating Conjunctions

Learning subordinating conjunctions becomes easier when you organize them by meaning and practice them in context.

Group conjunctions by function. Learn because and since for reasons, if and unless for conditions, when and before for time, and although and even though for concession.

Create your own examples. Write sentences about school, work, hobbies, or everyday routines. Using conjunctions in familiar situations helps you understand how they function.

Identify the relationship between clauses. Before choosing a conjunction, determine whether you want to express a reason, condition, time, purpose, or contrast. This makes it easier to select the correct word.

Review commonly confused structures. Practice distinguishing because from because of, although from despite, and the patterns involving although/but and because/so.

Combine theory with practice. Complete fill-in-the-blank questions, join clauses, and correct grammatical errors. Review the explanations rather than memorizing the answers alone.

These strategies can help you use subordinating conjunctions more accurately in conversations, essays, emails, and other forms of English writing.

Subordinating Conjunction Exercises with Answers

The following subordinating conjunction exercises will help you review the grammar rules and check your understanding.

Exercise 1: Choose the Correct Subordinating Conjunction

Complete each sentence with a suitable conjunction.

1. I stayed at home _____ I was feeling sick.
2. _____ it was raining, they went to the park.
3. Call me _____ you arrive at the airport.
4. You won’t pass the test _____ you study harder.
5. _____ I was studying, my brother was watching TV.
6. She saved money _____ she could buy a new laptop.
7. _____ you finish your homework, you can watch TV.

Answers and Explanations

1. Because. It introduces the reason for staying home.
2. Although. It expresses a contrast between the rain and the decision to visit the park.
3. When / as soon as. Both are possible, depending on whether the focus is on the time of arrival or the immediate sequence of events.
4. Unless. It introduces a negative condition: you will not pass if you do not study harder.
5. While. It describes two actions happening at the same time.
6. So that. It introduces the purpose of saving money.
7. After / when. Both can be correct, depending on whether the intended meaning is after completing the homework or when it is completed.

Exercise 2: Combine the Clauses

Join each pair of sentences using an appropriate subordinating conjunction.

1. I was tired. I continued working.
2. She didn’t go out. It was raining heavily.
3. You can borrow my book. You return it tomorrow.
4. He called me. He arrived at the station.

Suggested Answers

1. Although I was tired, I continued working.
2. She didn’t go out because it was raining heavily.
3. You can borrow my book as long as you return it tomorrow.
4. He called me when he arrived at the station.

Some sentences may have more than one correct answer. The important point is to choose a conjunction that expresses the intended relationship between the clauses.

Exercise 3: Find and Correct the Mistakes

Identify the grammatical mistake in each sentence and rewrite it correctly.

1. Although she was tired, but she continued studying.
2. We stayed home because of it was raining.
3. Because I was hungry, so I made a sandwich.
4. Despite she was sick, she went to work.

Answers and Explanations

1. Correct: Although she was tired, she continued studying.

Do not combine although and but to connect the same clauses in this construction.

2. Correct: We stayed home because it was raining.

Because introduces a clause with a subject and a verb. Another correct option is: We stayed home because of the rain.

3. Correct: Because I was hungry, I made a sandwich.

Alternatively: I was hungry, so I made a sandwich. Do not use because and so together in the original construction.

4. Correct: Although she was sick, she went to work.

Despite is not normally followed directly by a complete clause. Another correct option is: Despite being sick, she went to work.

Applying Subordinating Conjunctions in Everyday English

Learning the definitions of subordinating conjunctions is only the beginning. To use them naturally, you should pay attention to both sentence structure and communicative purpose.

In everyday conversations, conjunctions such as because, if, when, and although help you explain reasons, describe conditions, and communicate contrasting ideas. In academic and professional writing, they can make relationships between ideas clearer and improve the flow of an argument.

For example, instead of writing two separate sentences:

I was tired. I went to bed early.

You can connect them with a conjunction of reason:

I went to bed early because I was tired.

Similarly, you can express a contrast by using although:

Although the task was difficult, we completed it on time.

When writing, focus on clarity and grammatical accuracy. Using too many conjunctions in a single sentence may make your ideas unnecessarily complicated. Choose the conjunction that best expresses the relationship between the clauses, and make sure the sentence remains easy to understand.

Frequently Asked Questions About Subordinating Conjunctions

What are subordinating conjunctions in English?

Subordinating conjunctions are words or expressions that introduce dependent clauses and connect them to independent clauses. They show relationships such as cause, condition, time, concession, purpose, and place. Common examples include because, although, if, when, and so that.

What are the most common subordinating conjunctions?

Common subordinating conjunctions include because, since, as, if, unless, when, while, before, after, until, although, though, even though, so that, where, and wherever. Learning these words by function can help you remember their meanings and use them appropriately.

Where do subordinating conjunctions appear in a sentence?

A subordinating conjunction can introduce a dependent clause at the beginning of a sentence or appear after the independent clause. When the dependent clause comes first, a comma usually separates it from the main clause. When it comes afterward, a comma is generally unnecessary.

What is the difference between because and because of?

Because introduces a clause containing a subject and a verb, while because of is generally followed by a noun, noun phrase, or gerund phrase.

Examples:

We stayed home because it was raining.

We stayed home because of the rain.

Both sentences explain why the people stayed home, but they use different grammatical structures.

How can I remember subordinating conjunctions more easily?

Group conjunctions by function, create example sentences, and practice choosing the appropriate conjunction in context. Exercises involving sentence completion, clause combination, and error correction can help reinforce the rules. Pay particular attention to commonly confused structures, such as although/but and because/so.

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