Lesson 1: Commas with Compound Sentences

Definition

Use a comma before a coordinating conjunction (and, but, for, nor, or, so, or yet) when it joins independent clauses in a compound sentence.

Explanation

Think of an independent clause as a complete thought or a short sentence that can stand all by itself. A compound sentence is just two of these complete thoughts joined together. To connect them smoothly, you use a comma and a special joining word (like and, but, or or). The comma tells your reader to take a tiny pause before the next big idea starts.

Examples

• Maria wanted to go to the park, but it started to rain. [The compound sentence consists of two independent clauses joined by a comma and the word but.]
• The students finished their homework, and the teacher collected the papers. [The compound sentence consists of two independent clauses joined by a comma and the word and.]
• You can read the book first, or you can watch the movie adaptation instead. [The compound sentence consists of two independent clauses joined by a comma and the word or.]

Definition

Use commas to separate items in a series.
Use commas to separate two or more adjectives preceding a noun.

Explanation

Commas are super helpful for keeping your sentences organized! Use them to create a neat list of three or more things, which grammar experts call a series. This works for nouns, actions, or descriptions. You also use commas to separate two or more adjectives that are describing the same noun. It's like putting a little pause between your describing words.

Examples

Items in a Series:

• For breakfast, I had eggs, toast, and orange juice. [nouns]
• The old house was large, spooky, and quiet. [adjectives]
• Running, jumping, and swimming are my favorite summer activities. [gerunds]
• I need to know who is coming, what they are bringing, and when they will arrive. [subordinate clauses]