They __________ this research for years.
A. have done
B. have been doing
C. were doing
Random Topics:
Passive SentenceSynonymSentence Structure and Verb TensesVerbs & AdverbsDefinite ArticlesCompliment, Congratulation, and HopeGrammar - could / could notPresent Simple for Future ArrangementComparison & Modal Verbs in Passive VoiceGrammar (Adjectives)Other quiz:
Grammar › ViewChange an active voice below to be a passive voice.
My sister needs many papers for working.
A. Many papers are neededs by my sister for working.
B. Many papers is needed by my sister for working.
C. Many papers are needs by my sister for working.
D. Many papers are needing by my sister for working.
Conditional › View
If Johnny_____(not wear) a sweater, He___(catch)a cold .
A. don’t wear,catches
B. don’t wear,catch
C. doesn’t wear,will catch
D. doesn’t wear,will catches
IF CLAUSE › ViewIf you get back late, I………………. angry.
A. be
B. will be
C. will am
D. is
Tenses › View
What is the structure of the present continuous tense?
A. Subject + will be + verb-ing
B. Subject + have/has + verb-ed
C. Subject + was/were + verb-ing
D. Subject + am/is/are + verb-ing