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should have killed might have killed must have killed may have killed
Must; may not; have to May; mustn’t; can Should; can’t; may Must; needn’t; have to
should go should have gone might go may have gone
should study may have studied should have studied must have studied
mustn't; should do needn’t; should have done may not; should do can't; should have done
should have forgotten may have forgotten must have forgotten could have forgotten
could restart his study in school may also do well in his future work will be regretful about the bad results he has got at school should pay more attention to learning skills and developing abilities
may be had to should have been would be
should go should have gone might go may have gone
must have worked should have worked may have worked should work
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