Grammar: B1 - ✨ Grammar Essentials: ✏️ Writing Mechanics - Intermediate - Lesson 2: Commas with Coordinating Conjunctions (FANBOYS) linking independent clauses

✨ Lesson 2: Commas with Coordinating Conjunctions (FANBOYS)

In English, we often join two complete sentences (independent clauses1) to create one longer, more interesting sentence. To do this correctly, we need two things: a comma ( , ) and a special joining word.

These joining words are called coordinating conjunctions2. An easy way to remember the seven of them is with the acronym FANBOYS3.

What are the FANBOYS?

For(shows a reason)
And(adds a similar idea)
Nor(adds a negative alternative)
But(shows a contrast)
Or(shows a choice)
Yet(shows a contrast, like 'but')
So(shows a result)

The Golden Rule of Punctuation

This rule is one of the most important in English writing. When you join two independent clauses using a FANBOYS conjunction, you must use a comma before the conjunction.

[Complete Sentence] , + [FANBOYS] + [Complete Sentence].

Examples:

  • I visited the temples in the morning, and I relaxed in the afternoon.
  • The tour was fascinating, but it was also very tiring.
  • We can hire a tuk-tuk for the day, or we can rent bicycles.
  • It started to rain heavily, so we went back to the hotel.

Be Careful! Do not use a comma if you are not connecting two full sentences.
Correct: He visited the temple and took many photos.
(Here, "took many photos" is not a complete sentence, so no comma is needed.)

🧠 Practice Quiz: Add the Punctuation

Add a comma to these sentences where it is needed.

  1. She wanted to see the sunrise but she woke up too late.
    → She wanted to see the sunrise, but she woke up too late.
  2. I am very hungry so I am going to find a restaurant.
    → I am very hungry, so I am going to find a restaurant.
  3. He speaks Khmer and English fluently.
    Correct as is. (Not two complete sentences)
  4. Should we visit the museum or should we go shopping?
    → Should we visit the museum, or should we go shopping?
📝 Homework: Join the Sentences

Join the two simple sentences to make one compound sentence. Use the most logical FANBOYS conjunction and the correct punctuation.

Example: It was hot. We went swimming. → It was hot, so we went swimming.


1. He likes Cambodian food. He doesn't like spicy food.

→ ________________________________________________.

2. We can hire a tour guide. We can explore the temples by ourselves.

→ ________________________________________________.

(Example Answers: 1. He likes Cambodian food, but he doesn't like spicy food. 2. We can hire a tour guide, or we can explore the temples by ourselves.)

Vocabulary Glossary

  1. Independent Clause: (Noun) - ឃ្លាឯករាជ្យ (khlēa aek'kâ'rĭəch) - A group of words that can be a complete sentence by itself.
  2. Coordinating Conjunction: (Noun) - ឈ្នាប់សម្របសម្រួល (chhnŏăp sâmrôp'sâmruŏl) - A word that joins two elements of equal grammatical rank, like two independent clauses.
  3. FANBOYS: (Acronym) - FANBOYS - An easy way to remember the seven coordinating conjunctions: For, And, Nor, But, Or, Yet, So.

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