首先就是一些情态动词等,如can,could,may,might,must, need, should,will, would, ought to等
然后就是一些需要识记的短语:
最好做某事 had better do sth.
帮助某人做某事 help sb.(to) do sth.
让某人做某事 let sb. do sth.
使某人做某事 make sb. do sth.
为什么不做某事 why not do sth.
看见某人正在做某事 see/watch/notice/observe sb. do sth.
听见某人做了某事 hear sb. do sth.
宁愿做某事would rather do sth
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