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have done did had done have been doing
maybe had to should have been would be
give will be given will give am given
have you done had you done have you been doing did you do
should have been should be must be would have been
could do should have done had done could have done
may be had to should have been would be
不填；a the; a 不填; the a; the
have you done had you done have you been doing did you do
give will be given will give am given
may be had to should have been would be
as told as telling me as telling as I told
What are you doing What are you up to What do you think What have you done
give will be given will give am given
give will be given will give am given
to finish finishing to have finished having finished
look on look up to look forward to look down upon
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