Conjunctions in English: Types, Rules, and Examples

Conjunctions are small words with a big job. They connect words, phrases, and clauses so that a listener can understand how ideas relate. Without conjunctions, English can sound abrupt: "I studied. I was tired. I finished the assignment." With conjunctions, the relationship becomes clear: "Although I was tired, I studied, and I finished the assignment."

This guide explains the three main types of conjunctions, punctuation rules, common errors, and practical ways to improve. Conjunctions also make more sense when you understand essential English grammar rules and how English sentence structure works.

What Are Conjunctions?

A conjunction is a word or phrase that joins grammatical elements. A conjunction can connect single words, groups of words, or complete clauses.

• Words: "coffee and tea"
• Phrases: "in the morning or after work"
• Clauses: "I called her because I needed help."

Conjunctions do more than join pieces of a sentence. They identify a logical relationship. The English word "and" adds information. The word "but" introduces contrast. The word "because" gives a reason. The word "if" sets a condition.

Compare these sentences:

• "I like coffee and tea." The speaker likes both drinks.
• "I like coffee, but I prefer tea." The second idea contrasts with the first.
• "I drink tea because coffee keeps me awake." The second clause explains a reason.
• "I will make tea if we have enough time." The action depends on a condition.

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

Coordinating Conjunctions and FANBOYS

Coordinating conjunctions join elements of equal grammatical importance. The seven coordinating conjunctions are often remembered with the acronym FANBOYS:

• "for" gives a reason: "We left early, for the road was getting busy."
• "and" adds information: "She studies grammar and pronunciation."
• "nor" adds a negative alternative: "He did not call, nor did he send a message."
• "but" shows contrast: "The rule is simple, but the exceptions are difficult."
• "or" presents a choice: "You can practice speaking or writing."
• "yet" shows an unexpected contrast: "The exercise was short, yet it was challenging."
• "so" gives a result: "The bus was late, so we walked."

The word "for" sounds more formal than "because" when it means "because." The word "nor" also has a formal pattern. When "nor" starts the second independent clause, the auxiliary verb often comes before the subject: "She did not complain, nor did she leave."

Commas with coordinating conjunctions

Use a comma before a coordinating conjunction when it connects two independent clauses. An independent clause has a subject and a verb and can stand alone.

• "I wanted to join the class, but I had to work."
• "The lesson was challenging, so I reviewed my notes."

Do not use a comma when the conjunction joins only two words, phrases, or verbs that share the same subject.

• "I practiced speaking and writing."
• "The sentence is short but clear."
• "Mina opened her notebook and reviewed the lesson."

The test is simple: read each side of the conjunction separately. If both sides are complete sentences, a comma is usually needed.

Subordinating Conjunctions

Subordinating conjunctions connect a dependent clause to an independent clause. A dependent clause contains a subject and verb, but it cannot express a complete thought by itself.

For example, "Because I was tired" leaves the listener waiting for more information. The complete sentence "Because I was tired, I made a mistake" gives both the reason and the result.

Common subordinating conjunctions can be grouped by meaning:

• Reason: "because," "since," "as"
• Time: "when," "while," "before," "after," "until," "once"
• Condition: "if," "unless," "provided that"
• Contrast: "although," "though," "even though," "whereas"
• Purpose: "so that"

Examples show how the conjunction controls the relationship:

• Reason: "I reviewed the rule because I made the same mistake twice."
• Time: "Call me when you finish the exercise."
• Condition: "If you practice daily, your sentences will become more natural."
• Contrast: "Although grammar can feel difficult, patterns become easier with repetition."
• Purpose: "Write the examples down so that you can review them later."

Clause order and commas

When the dependent clause comes first, place a comma after it:

• "When the class ended, the students continued their conversation."
• "Although he felt nervous, he gave the presentation."

When the independent clause comes first, a comma is usually unnecessary:

• "The students continued their conversation when the class ended."
• "He gave the presentation although he felt nervous."

The meaning usually stays the same, but the first position gives the dependent clause more emphasis.

Correlative Conjunctions and Parallel Structure

Correlative conjunctions work in pairs. Common pairs include "both ... and," "either ... or," "neither ... nor," "not only ... but also," and "whether ... or."

Both sides of the pair should have the same grammatical form. This is called parallel structure.

• Correct: "She wants to improve both speaking and writing."
• Not parallel: "She wants both to improve speaking and better writing."
• Correct: "The class is not only useful but also practical."
• Correct: "You can either study now or review the lesson tomorrow."

Placement matters. Put each half of the pair directly before the elements being compared. In "She either practices English before breakfast or after dinner," "either" appears before the verb while "or" appears before a time phrase. A clearer version is "She practices English either before breakfast or after dinner."

With "either ... or" and "neither ... nor," the verb commonly agrees with the subject closest to it:

• "Either the teacher or the students are presenting today."
• "Either the students or the teacher is presenting today."

In formal writing, revise an awkward sentence if the agreement distracts the reader.

Conjunctive Adverbs Are Different

Words such as "however," "therefore," "moreover," "instead," and "otherwise" connect ideas, but they are not coordinating conjunctions. They are conjunctive adverbs. This difference affects punctuation.

Do not join two independent clauses with only a comma and "however."

• Incorrect: "I studied the rule, however, I still made a mistake."
• Correct: "I studied the rule; however, I still made a mistake."
• Correct: "I studied the rule. However, I still made a mistake."

A semicolon can connect the two independent clauses. A comma usually follows the conjunctive adverb. This pattern is especially useful in clear academic and everyday writing.

Common Mistakes with Conjunctions

Using "because" and "so" together

The word "because" introduces a reason, while "so" introduces a result. Standard English normally uses one of them, not both, to connect the same two clauses.

• Incorrect: "Because it rained, so we stayed home."
• Correct: "Because it rained, we stayed home."
• Correct: "It rained, so we stayed home."

Creating a comma splice

A comma alone cannot normally join two independent clauses.

• Incorrect: "I studied grammar, I still made mistakes."
• Correct: "I studied grammar, but I still made mistakes."
• Correct: "I studied grammar; however, I still made mistakes."

Leaving a dependent clause alone

• Fragment: "Although the lesson was difficult."
• Complete: "Although the lesson was difficult, everyone finished it."

Adding too many conjunctions

Several connected clauses can make a sentence hard to follow. If a sentence contains three or four major ideas, divide it. Clear English is more important than showing how long a sentence can be.

Confusing "despite" with "although"

"Although" is a conjunction and comes before a clause. "Despite" is a preposition and comes before a noun or an "-ing" form.

• "Although it was raining, we walked."
• "Despite the rain, we walked."
• "Despite feeling tired, she practiced."

How to Practice Conjunctions

Begin with sentence combining. Write two short sentences, identify the relationship, and choose a conjunction.

• "The exercise was difficult."
• "I finished it."
• Contrast: "The exercise was difficult, but I finished it."

Then express one situation in several ways:

• "I stayed home because it rained."
• "It rained, so I stayed home."
• "Although it rained, I went out."

Next, practice aloud. Choose a topic and answer with a reason, contrast, and condition:

• Reason: "I study English because I want to work internationally."
• Contrast: "I understand the rule, but I need more speaking practice."
• Condition: "If I have time tonight, I will review my notes."

At Columbia West College (CWC), grammar concepts connect with speaking and reading and writing work through an integrated curriculum. English Speaking Success (ESS) also gives students a daily 80-minute class dedicated to speaking practice, which provides 6 times more speaking practice than a typical listening and speaking class. That repeated output helps learners turn conjunction rules into natural communication.

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A Quick Editing Checklist

Before you finish a paragraph, ask:

1. Does each conjunction express the relationship I intend?
2. Can every independent clause stand alone?
3. Did I place a comma before FANBOYS when it joins two independent clauses?
4. Did I use a comma after an introductory dependent clause?
5. Are both sides of a correlative pair parallel?
6. Would two shorter sentences be clearer?

Reading your work aloud is especially effective. You can often hear a missing connection or an overloaded sentence before you can identify the grammar problem.

FAQ

What are the three main types of conjunctions?

The three main types are coordinating, subordinating, and correlative conjunctions. Coordinating conjunctions join equal elements. Subordinating conjunctions connect dependent and independent clauses. Correlative conjunctions work in pairs.

Do I always need a comma before "and"?

No. Use a comma before "and" when it joins two independent clauses. Do not normally use a comma when "and" joins only words, phrases, or two verbs with one shared subject.

What is the easiest way to remember coordinating conjunctions?

Use FANBOYS: "for," "and," "nor," "but," "or," "yet," and "so."

Can a sentence begin with "and" or "but"?

Yes. Modern English allows a sentence to begin with "and" or "but" when the connection is clear. Use the technique thoughtfully and avoid repeating it too often in formal writing.

How can I use conjunctions more naturally when speaking?

Practice extending short answers with one reason, contrast, or condition. CWC students can build this habit through structured speaking activities. For more ideas, see these practical English speaking exercises.

Strong grammar becomes valuable when you can use it in real conversations. CWC's integrated curriculum reinforces concepts across Grammar, Speaking, and Reading and Writing classes, while ESS provides focused daily speaking practice. Contact CWC to learn about studying English in Los Angeles.