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not; not don't; won't won't; don't don't; don't
must；must had to；have to had to； must have to；must
if they have no work if they study if they don’t study if they are working
The hard, the good The harder, the better The hardest, the best The harder, the good
take the lead, hard-working fall behind, work hard fall behind, working hard take the lead, hard work
by chance to be honest above all for fun
study studying to study studied
must have studied should have studied must study should study
had studied hard; would have been should have studied hard; should have been had studied hard; would be would study hard; must have been
encourage makes to ask to encourage
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