[ Present Perfect Tense ]
That scientist _________________ a cure for one type of cancer. His achievement was announced in the NY Times last week.
A. Discovers
B. Is discovered
C. Is discovering
D. Has discovered
Select your answer:
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Modal Verbs › ViewWhich sentence is grammatically correct?
A. We ought to cancels the launch.
B. You ought to know better.
C. She should cleaned up her mess.
D. Should they waited?
Modal Verbs › View
We …………… to go to the supermarket because we had lots of food.
A. needn’t have
B. don’t need
C. didn’t need