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should have failed might have failed couldn’t have failed mustn’t have failed
deserved succeeded missed considered
has failed fails failed failing
should have failed shouldn’t have failed must have failed mustn’t have failed
None of the students have passed the exam. Not all the students have passed the exam. None of the students have failed in the exam. Most of the students haven’t passed t he exam.
should have failed couldn’ t have failed might have failed mustn’ t have failed
have failed had been failed has failed will be failed
had he failed; he realized he had failed; did he realize he had failed; he realized had he failed; did he realize
should have failed couldn’t have failed might have failed needn’t have failed
failed in would have failed wouldn’t pass would fail
failed had failed have failed has failed
should fail would have failed may have failed should have failed
Having failed Fail Failed To fail
deserved knew considered missed
deserved succeeded missed considered
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