Incorrect Punctuation of Two Independent Clauses
An independent clause has a subject and a verb and can stand alone as a sentence.
Good writers know that correct punctuation is important to writing clear sentences. If you misuse a mark of punctuation, you risk confusing your reader and appearing careless. Notice how the placement of commas significantly affects the meaning of these sentences:
Mr. Jones, says Ms. Moore, is a boring old fool.
Mr. Jones says Ms. Moore is a boring old fool.
Writers often combine independent clauses in a single compound sentence to emphasize the relationship between ideas. The punctuation of compound sentences varies depending upon how you connect the clauses.
The Rules
(a) Separate independent clauses with a comma when using a coordinating
conjunction (and, but, or, for, nor, so, yet).
(b) Separate independent clauses with a semi-colon when no coordinating
conjunction is used.
(c) Separate independent clauses with a semi-colon when using a conjunctive adverb
(e.g., however, therefore, thus, consequently, finally, nevertheless).
Examples of Correct Punctuation, Rule a:
- We all looked worse than usual, for we had stayed up studying for the exam.
- This room is unbelievably hot, and I think that I am going to pass out.
- Monday is a difficult day for me, so I try to prepare as much as possible on Sunday.
Examples of Correct Punctuation, Rule b:
- We all looked worse than usual; we had stayed up all night studying for the exam.
- This room is unbelievably hot; I think I am going to pass out.
- Monday is a difficult day for me; I have three classes and two other commitments.
Examples of Correct Punctuation, Rule c:
- We all looked worse than usual; however, we were relieved we had studied.
- The discussion is really interesting; nevertheless, I think I am going to pass out.
- Monday is a difficult day for me; however, I have figured out how to prepare for it.