Compound Sentence without Coordinating Conjunction

When a compound sentence, which has two independent clauses, has no coordinating conjunction between those two independent clauses, the recommended punctuation is a semicolon. The pattern looks like this:

Compound sentence without coordinating conjunction

Note: You cannot use a comma to join these two independent clauses because there is no coordinating conjunction. When two independent clauses occur in the same sentence, the semicolon is mandatory. You may also replace the semicolon with a period and create two sentences.

Compound sentence: comma not enough without coordinating conjunction

Incorrect—with comma:

He asked me for the report, I gave it to him.

Correct—with semicolon:

He asked me for the report; I gave it to him.