EXPLANATION
E10. Identify the sentence that uses the correct form of the verb "to be" in the past perfect tense:
a) She has been studying for the exam.
b) She had been studying for the exam.
c) She have been studying for the exam.
d) She was been studying for the exam.
ANSWER: b) She had been studying for the exam.
EXPLANATION:
The sentence that uses the correct form of the verb "to be" in the past perfect tense is:
b) She had been studying for the exam.
In the past perfect tense, the auxiliary verb "had" is used with the past participle form of the main verb. In this case, the main verb is "study," and its past participle form is "studied." Therefore, the correct sentence is "She had been studying for the exam," indicating that the studying had occurred before a specific point in the past.
