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She's always helpful. A. need have been could have been should have been must have been
Should, should have done Shall; may have done Must, should do Must, should not have done
mustn't; should do needn’t; should have done may not; should do can't; should have done
can not have done must not have done shouldn’t have done needn’t have done
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would have done would do should have done should do
to do to doing to have done
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doI. didn’t she did she don’t I
would have done would do should have done should do
should might needn’t couldn’t
Should; must not have done Shall; may have done Must; should do Must; should not have done
need have been could have been should have been must have been
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would have done would do should have done should do