Introduction to Conjunctions: Types, Rules and Examples

Overview

A conjunction is a word that connects. It joins words, phrases, or clauses within a sentence, allowing a writer to express relationships between ideas without starting a new sentence every time. Without conjunctions, writing becomes choppy and repetitive, with every thought sitting in isolation from the one before it.

Conjunctions work in two main ways at this level. Some join elements of equal weight, linking two nouns, two verbs, or two independent clauses side by side. Others signal that one part of the sentence depends on another, introducing a condition, a reason, or a contrast. Each type follows its own placement rules, and knowing the difference between them makes it easier to write naturally and correctly.

What Conjunctions Do

The conjunction chosen tells the reader what kind of link exists between two ideas. Consider the difference between and, but, and so. Each one joins two clauses, but the meaning changes entirely depending on which word is used.

Choosing the right conjunction is not just a grammar decision but a meaning decision.

Coordinating Conjunctions

Coordinating conjunctions join two elements of equal grammatical rank. That means they can join two nouns, two adjectives, two verbs, two phrases, or two independent clauses. The most common coordinating conjunctions in English are for, and, nor, but, or, yet, and so, often remembered by the acronym FANBOYS.

At the A2 level, the ones that appear most often are and, but, or, and so. They sit between the two elements they connect, and when they join two independent clauses, a comma usually comes before the conjunction.

Subordinating Conjunctions

A subordinating conjunction introduces a dependent clause, which is a clause that cannot stand alone as a complete sentence. Common subordinating conjunctions include because, although, if, when, before, after, since, until, and unless.

The dependent clause can appear at the beginning or end of the sentence. When it comes first, a comma separates it from the main clause. When it comes second, no comma is needed in most cases.

Correlative Conjunctions

Correlative conjunctions work in pairs to frame two related ideas. Common pairs include both...and, either...or, and neither...nor. These are introduced briefly here; they are covered in full at a higher level.

Coordinating vs. Subordinating Conjunctions

A coordinating conjunction cannot start a sentence in formal writing because it has nothing to attach to on the left side. A subordinating conjunction, by contrast, regularly begins a sentence when the dependent clause comes before the main clause.

Common Mistakes to Avoid

Mistake 1: Using a Comma Splice Instead of a Conjunction

Joining two complete sentences with only a comma creates a comma splice, which is an error. A coordinating conjunction must appear after the comma to make the connection grammatically correct.

Mistake 2: Omitting the Comma Before a Coordinating Conjunction

When and, but, or, or so joins two full independent clauses, a comma comes before the conjunction. Leaving it out is a common error, especially with longer clauses.

Mistake 3: Placing a Comma Before a Subordinating Conjunction When the Main Clause Comes First

When the main clause comes before the dependent clause, no comma is needed. Adding one is a frequent mistake at this level.

Mistake 4: Confusing But and Although

Both words signal contrast, but they work differently. But is a coordinating conjunction that joins two equal clauses. Although is a subordinating conjunction that introduces a dependent clause. Using both together in the same sentence is a double conjunction error.

Mistake 5: Using Because When Because Of Is Needed

Because introduces a clause with a subject and verb. Because of is a preposition that introduces a noun or noun phrase. Using because before a noun without a verb produces an error.

Mistake 6: Double Negatives with Neither...Nor

Neither...nor already carries a negative meaning. Adding another negative word creates a grammatical error.

Practice Exercises

Exercise 1: Choose the Correct Conjunction

Choose the best conjunction to complete each sentence.

1. He was nervous, _______ he gave an excellent presentation. (but / so)
2. _______ you finish your homework, you can watch a film. (Although / If)
3. The restaurant was full, _______ they found a table outside. (so / but)
4. She did not go to the party _______ she was not feeling well. (because / although)
5. He trained every day, _______ he won the competition. (but / so)

Exercise 2: Identify the Type of Conjunction

Read each sentence and write whether the underlined conjunction is coordinating (C) or subordinating (S).

1. She packed her bag and left without saying goodbye.
2. Although the film was long, everyone enjoyed it.
3. He was quiet because he did not know the answer.
4. They finished the project, so the manager was pleased.
5. If it rains tomorrow, we will cancel the trip.

Exercise 3: Correct the Mistakes

Each sentence contains one error involving a conjunction. Rewrite the sentence correctly.

1. She was hungry, she made a sandwich.
2. Although he was experienced, but he made several errors.
3. Neither the manager didn't attend nor the assistant.
4. He left early, because he had an appointment.
5. She stayed home because the bad weather.

Summary

Used accurately, conjunctions allow a learner to express contrast, cause, condition, and addition in a single sentence rather than across several short ones.