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studied had studied will study have been studying
Have you studied Did you study Had you studied Do you study
If he were to study If he studied hard Had he studied hard Should he study hard
must have studied would have studied should be studying ought to have been studying
had studied hard; would have been should have studied hard; should have been had studied hard; would be would study hard; must have been
would have been would be are be
If he were to study If he studied hard Had he studied hard Should he study hard
Studied hard would study hard had studied hard Have studied hard
should study may have studied should have studied must have studied
So he has; so you have So he has; so have you So has he;so have you So has he; so you have
studied had studied will study have been studying
had studied;would be sitting study;are have studied; would be sitting studied; are sitting
must have studied should have studied must study should study
studied had studied will study have been studying
Have you studied Did you study Had you studied Do you study
should have studied must have to study must have studied needn't have studied
could have studied hard must have studied hard should have studied hard might have studied hard
has not studied biology did study biology had studied biology studied biology
had studied;would be sitting study;are have studied; would be sitting studied; are sitting
Have you studied Did you study Had you studied Do you study
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