Final answer:
The statement is false; when a sentence begins with a subordinating conjunction introducing a dependent clause, a comma should follow that clause if it precedes the main clause. The use of commas serves to separate the dependent clause from the independent clause, ensuring sentence clarity.
Step-by-step explanation:
The statement that when a sentence begins with a subordinating conjunction, it does not need a comma is false. When a sentence begins with a subordinating conjunction, such as although, because, if, when, since, and others, it often introduces a dependent clause that should be followed by a comma when it precedes the main clause of the sentence for clarity. This introductory dependent clause sets the stage for the main information in the independent clause that follows it. In contrast, if the independent clause comes first, followed by the dependent clause, a comma is not typically used unless the subordinating conjunction implies contrast, like with the conjunction whereas or though.
For example:
- If you speak the truth, have a foot in the stirrup.
- He canceled his magazine subscription because he thought the editors no longer addressed important issues. (No comma is used here because the independent clause comes first and there's no contrast implied.)
According to the rules of grammar, the placement of commas in a sentence can significantly affect its meaning and clarity, which is why understanding how to use commas with dependent and independent clauses is essential.