5.在两个动词不定式并列使用时,为了避免重复,后面的不定式符号to可省略。 The little girl hardly knew whether to laugh or cry. 这小姑娘不知道是哭好还是笑好。 Can you help me to call him and ask him to attend the meeting at 200 p.m. 你能不能帮我打电话给他,叫他下午两点来开会?
6.在help之后,既可用带to的不定式也可用不带to的不定式。 Can I help (to) carry the box for you 我帮你搬箱子,好吗?
7.在一些固定搭配中用不带to的不定式。 He let go the rope. 他松开了绳子。 I hear say there will be an earthquake soon. 我听说不久就要有一次地震。 She made believe she was innocent. 她假装清白。
8.在感官动词see, hear, watch, feel, notice以及使役动词make, let, have等后作宾语补足语的动词不定式不带to。 She watched the children cross the street. 她看着孩子们穿过了马路。 They made the boy apologize to his friend for being so rude. 他们让那男孩因他的粗鲁而向他的朋友道歉。 Don't forget to have him come earlier. 别忘了让他早点儿来。
B.不定式符号的单独使用 为了避免重复上文中出现过的动词,可以用不定式符号to来代替上文中出现过的不定式结构。 1.在助动词或情态动词之后,如be going to, used to, have to, ought to, be able to, be about to等。 She must go but you don't have to. 她必须走,但你没有必要。 ---Do you think I ought to go to see my doctor 你认为我应该去看医生吗? ---Yes, I think you ought to. 是的,我想你应该去。 2.在want, decide, like, love, hope, wish, mean, refuse, try等动词之后。 You may go with them if you hope to. 如果你希望的话,你可以和他们一起去。 ---Did you go to see the Great Wall 你游览长城了吗? ---I wanted to, but I was too busy. 我本来想去的,但我太忙了。 3.在做宾语补足语的ask, tell, order, advise, persuade, warn, wish, permit, allow, forbid等动词之后。 Don't do anything unless your father tells you to. 除非你父亲叫你去做,不然不要做任何事情。 ---May I use your car 我可以用你的汽车吗? ---No, I forbid you to. 不,我禁止你使用。 4.在对话的答语中的happy, glad, eager, anxious, willing, ready, pleased, afraid等形容词之后。 ---Will you lend me a hand 你能帮我一个忙吗? ---I'm willing to, but I can't now. 我很愿意,但现在不行。 ---Would you please come to my birthday party tomorrow 明天下午来参加我的生日聚会好吗? ---I'll be glad to. 我很乐意。 提示: 如果动词不定式是to be或to have,则一般不省。 --- Did you finish the work 你的工作完成了吗? --- No, but I hoped to have. 没有,但我希望已经完成了。
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