6.在why, why not 引导的特殊问句中后跟省略to的动词不定式。
Why talk so much about it? /Why not try it again?
7.动词不定式与 be able to,
be going to, have to, ought to, used to等构成复合谓语时,不定式结构常可省略,但要保留不定式符号to。
I don't want to wait for him, but I have to.
He doesn't like fish, but he used to.
— Why didn't you come to our party?
— I was going to, but l had a report to write.
8.动词不定式中动词原形部分是否省略,主要看句子前面是否已出现过同样的动词。如果句子前面出现过同样的动词,为了避免重复,句子后面的不定式常省略动词原形,而保留不定式符号to。
They may go if they wish to.
Don't go till I tell you to.
9.动词不定式在 ask,
warn,
tell,
advise, force, wish, expect, allow, permit, invite, persuade, order, would like, forbid等动词后作宾语补足语或主语补足语时,常可省略。
The students want to enter the lab, but the monitor advises them not to (enter the lab).
10.系动词(be)+形容词,即be afraid / ready / glad / happy / willing等后面接不定式时有时为了避免重复,常省略与上文表达相同意思的不定式符号to之后的内容,只保留不定式符号。
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