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go on doing go on to do go on with go on
have finished finished had finished finish
finishing to finish finish finished
needn’t may not mustn’t couldn’t
will do have to finish must finish would do
can’t; need mustn’t; may needn’t; must mustn’t; can
mustn’t；can needn’t；must don’t have to；may can’t have to；may
can’t; need Mustn’t; may needn’t; must mustn’t; can
Must; mustn’t Can; needn’t Can; mustn’t Must; needn’t
can’t; may mustn’t; must needn’t; may mustn’t; can
must, mustn’t must , don’t have to may, needn’t may , mustn’t
May, must Must, may Must, may Must, must
finish will finish must finish have finished
may, mustn’t must, can’t may, may not must, needn’t
Must; mustn’t Can; needn’t Can; mustn’t Must; needn’t
must not don’t needn’t can’t
do; don’t have to do; mustn’t must; don’t have to must; mustn’t
can’t; may mustn’t; must needn’t; may mustn’t; can
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