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are waiting have been waiting have waited will wait
lying; must have happened lie; must happen lay; might have happened had lain; could have happen
are waiting have been waiting have waited will wait
ought must should to ought to
should have missed must have caught must have missed might miss
may have been may be must be can’t have been
mustn't haven't didn't hasn't
mustn't didn't haven't hadn't
mustn’t haven’t didn’t hasn’t
must have waited might have waited would have waited could have waited
mustn’t you needn’t you didn’t you haven’t you
mustn’t, did couldn’t, has must, haven’t must, didn’t
are waiting have been waiting have waited will wait
should wait must have waited should have waited must wait
had to be should be would be would have been
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