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doesn’t won’t might not couldn’t
when, who that, that when, that that, where
减少、增加、不变 增加、增加、不变 增加、不变、不变 增加、增加、降低
Though Whether Until Unless
However the weather is like However is the weather like Whatever is the weather like Whatever the weather is like
needn’t may not shouldn’t mustn’t
what however whatever how
Should I have invited Must I have invited Must I invite Can I have invited
although as soon as as long as while
shall have to; shall be able shall have to; am able would have to; were able would have to; would be able
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