Use a comma between two complete sentences joined with a coordinating conjunction. There are 7 coordinating conjunctions: and, but, or, nor, yet, so, for. Common mistake: Unnecessary comma—Using a comma with a conjunction to join a complete sentence to an incomplete sentence.

How to punctuate coordinating conjunctions. When a coordinating conjunction joins two independent clauses, a comma is used before the coordinating conjunction (unless the two independent clauses are very short). Conjunctions that are not followed by non-essential elements should never be followed by commas.

The word and is a conjunction, and when a conjunction joins two independent clauses, you should use a comma with it. The proper place for the comma is before the conjunction. Here’s a tip: Remember, when you’re joining two independent clauses, you need both a comma and a conjunction.

Extended Rules for Using Commas

• Use commas to separate independent clauses when they are joined by any of these seven coordinating conjunctions: and, but, for, or, nor, so, yet.
• Use commas after introductory a) clauses, b) phrases, or c) words that come before the main clause.

However, transition words can also be placed at the beginning of a new paragraph or sentence – not only to indicate a step forward in the reasoning, but also to relate the new material to the preceding thoughts.

Paragraph Starters for Informational Essays

• This essay will explore/examine/discuss….
• In this essay, I will analyze….
• Experts agree that….
• There are many ways to….
• Have you ever….
• Would you believe that….
• It’s an accepted fact that….
• It’s may be difficult to believe that….