[ Past Perfect Tense ]
We form the past perfect with had and the _____ of the main verb.
A. affirmative
B. before
C. negative
D. past participle

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Subject Verb Agreement › ViewIdentify the subject-verb agreement error in the following sentence: “Both of the solutions is acceptable.”
A. Both of the solutions
B. is
C. acceptable
D. None of the above
Grammar › View
If you really _____ smoke, do it outside.
A. must
B. don’t have to
C. should
