Which form does a verb take when the speaker gives a command without stating the subject?

passive

indicative

subjunctive

imperative

The best answer from the choices given is letter D, Imperative.

Imperative verbs are verbs which create an imperative sentence, i. e. a sentence that gives an order. It will always sound like the speaker is bossing someone around. Imperative verbs don’t leave room for questions or discussion, even if the sentence has a polite tone.

Use the root form of the verb to create the imperative.

Example: Give me that book!

In your own words, explain when a comma is necessary to set apart a subordinate clause and when it is not. Provide a sample sentence to illustrate the rule.