Select the correct tense: The boys were severely punished by the principal.

Correct answer: Simple past (past simple passive)

Explanation:

The sentence "The boys were severely punished by the principal." is in the past simple passive. It uses the past form of the verb to be ("were") + the past participle "punished", and the agent is introduced by "by the principal".

• Structure: subject + was/were + past participle (+ by agent).

• "Were" matches the plural subject "the boys" (past of "be").

• "Punished" is the past participle (for regular verbs the past simple and past participle forms are the same), which forms the passive with the verb to be.

Why the other tense choices are incorrect:

• Past continuous: uses "was/were" + verb-ing (e.g., "were punishing"). The sentence does not use a verb-ing form.

• Past perfect continuous: uses "had been" + verb-ing (e.g., "had been punishing"), which is different from the given form.

• Past perfect: uses "had" + past participle (e.g., "had punished" or passive "had been punished"). The sentence uses "were" rather than "had".

Summary: The verb form is "were + past participle", so the sentence is the past simple in passive voice.