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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.
work working to work worked
had seen; was playing saw; played had seen; playing saw; was playing
can’t isn’t didn’t hasn’t
didn’t he mustn’t he didn’t John hasn’t he
anywhere everywhere nowhere somewhere
can’t isn’t didn’t hasn’t
work working to work worked
event occasion chance affair
didn’t he don’t I do I mustn’t he
saw has seen had seen would see
Saw; haven’t seen have seen; didn’t see have seen; haven’t seen saw; didn’t see
mustn’t have seen shouldn’t see can’t have seen couldn’t see
play playing played to play
hadn’t seen haven’t seen didn’t see wouldn’t see
had seen; was writing saw; wrote had seen；wrote saw；was writing
when, what that, what whose, that while, which
something unusual , last night unusual something , the night before anything unusual, last night anything unusual , the night before
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