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used to +v,be used to +v-ing和be used to +v
(1)used to +v意为“过去常常”,“过去一直”;be used to +v-ing/n(名词)意为“习惯于”;be used to +v意为“被用来(做某事)”。
(2)used to只表示过去,而be used to +v-ing/n可表示现在、过去或将来。例如:
1)He used to smoke. Now he doesn't.
2)He's quite used to hard work/working hard.
3)The knife is used to cut bread.
用作情态动词的其他短语
would rather,would sooner,would(just)as soon,had rather,had better,had sooner,can not but,may(just)as well等可用作情态动词。例如:
1)The soldier would sooner die than surrender.
2)The brave soldier would as soon die as yield to such an enemy.
3)I'd rather walk than take a bus.
4)If you don't like to swim,you may just as well stay at home.
注:这些短语后一般直接跟动词原形。would(had)rather,would(had)sooner,would(just)as soon后可跟that 引导的从句,that 常省去,从句要用虚拟语气。对现在和将来的假设用过去时,对过去的假设用过去完成时。例如:
1)I would rather you came on Sunday.
2)I would sooner you hadn't asked me to speak yesterday.
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