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if I had seen his sister the night beforE. whether I had seen your sister the night beforE. did I have seen his sister the night beforE. that I saw his sister the night beforE.
though either too instead
mustn’t have seen shouldn’t have seen couldn’t have seen needn’t have seen
You may ask your sister to do, too. No, but I can’t afford the timE. No, I’d like to. No, I don’t feel in the mood for it now
She stayed at home She visited her uncle She went to New York City She wants to go to Hainan
where does your sister work where did your sister work where your sister works where your sister worked
what is your sister doing what your sister is doing when your sister is doing homework where is your sister doing homework
can’t won’t mustn’t needn’t
didn’t need to needn’t have couldn’t have shouldn’t
must have been can’t have been oughtn’t to be should have been
where does your sister work where did your sister work where your sister works where your sister worked
to tell not not to tell don’t tell not tell
does; buy did; buy did; bought does; bought
or;goes nor;go or;go nor;goes
No,but I can’t afford the time No,I don’t feel in the mood for it now You may ask your sister to go,too No,thank you
where is your sister What does your sister do what your sister is what's your sister
A.Not only; but also Either; or Neither; nor Both; and
to tell not not to tell don’t tell not tell
That's all right I'm sorry to hear that She has to stay in bed I hope not