Number 9, is the one I’m confused on

False

Explanation:

Subordinating conjunctions allow writers to construct complex sentences, which have an independent clause and a subordinate (or dependent) clause. Either clause can come first.

The students acted differently whenever a substitute taught the class.

Whenever a substitute taught the class, the students acted differently.

Note that the clauses are separated with a comma when the dependent clause comes first.

Some common subordinating conjunctions are: after, as, before, once, since, until, and while.

Some Common Errors to Avoid

Comma Splices