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ought to help must help must have helped ought to have helped
should die would have died must have died could die
would help must have helped would have helped might help
must not have couldn't have may not have can't have
must have lost may lose might have lost should lose
must have asked should ask could have asked had asked
might have; would help could have been; helped must have; helped should have been; was helping
could have asked could ask must have asked must ask
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must fail might fail would have failed will fail
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would cause must have caused would have caused may cause
must have been would have been would be must be
could help should help could have helped must have helped
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