[ Subject-Verb Agreement ]
He is tired because he had been ____ (sing) for hours.
A. Sings
B. Sang
C. Sing
D. Singing
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Past Tense & Present Perfect TenseFuture - be going tomust/shouldModal Auxiliaries and To Be VerbsGerunds as objects of prepositionTenses and Verb FormsDo / Have / Can - Basic QuestionsGrammar & VocabularyPast Simple and Past Continuous TensesEmployment VocabularyOther quiz:
Adjectives and comparisons › ViewThe elephant is ……. than the mouse ( big).
A. bigger
B. biggest
Idioms › View
These big books shouldn’t be taken ___ from the library.
a. after
b. in
c. away