How do commas work within sentences?

Use a comma between two long independent clauses when conjunctions such as and, or, but, for, nor connect them. Example: I have painted the entire house, but she is still working on sanding the floors. Rule: If the clauses are both short, you may omit the comma.

quite an interesting way to teach topic sentences, because the answer to this question is the best definition of a topic sentence that one can present, it is as if answering the questions taught you how to do it, this is some real teaching, it is terribly well-done.

the topic sentence in this paragraph is:

topic sentences writers stay on track and keep a paragraph from becoming an aimless collection of sentences about an idea.

which incidentally tells you what a topic sentence should be.

yes

explanation: