In the sentence 'Dr. Chandra had explained his theory to ...

★ Verb Types and Tenses

In the sentence ‘Dr. Chandra had explained his theory to the class last week,’ which tense is ‘had explained’?

A. Past Perfect

B. Present Perfect

C. Future Perfect

D. Past Progressive

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What tense should be used to rewrite ‘Sharks circle the wounded dolphin’ in past progressive?

A. Sharks circled the wounded dolphin.

B. Sharks were circling the wounded dolphin.

C. Sharks will be circling the wounded dolphin.

D. Sharks have circled the wounded dolphin.