[ Grammar ]
The scientists ____________ the cause of the problem. (not/understand)
A. not under stand
B. do not understand
Random Topics:
Comparatives - SuperlativeGrammar - ConnectorsNarrative Tenses & ConditionalsModals for Ability, Possibility and PermissionHas and HaveQuestion tag and + - AgreementIntensifiers: Really vs Very-ed or -ingBecause / soModals for ObligationOther quiz:
Grammar › ViewWhich of these words are nouns?
Last year we walked up the hill in the rain.
A. last
B. walked
C. hill
Relative Pronouns › View
That is the man _______________ helped us to find the theatre.
A. who
B. whose
C. where
D. which
Infinitive › ViewDo you want___________ basketball?
A. to play
B. play
Modals › View
____ you help me carry these boxes?
A. Can
B. Should
C. Might
D. Must