省to宾补有十一，五看二听三使役;
一个帮助两均可，还有一个是感觉。
如若主动变被动，小to一定要带齐。
即：在have, let, make使役动词;notice, observe, see, watch, look at, hear, listen to, feel, help等感观动词 + sb. do sth.
动词不定式的省略
1、在 be + 形容词 (如：glad, happy, pleased, anxious, willing, ready等词后保留 to.
1)-- Will you join us in a talk?
-- Yes, I’ll be glad to.
不定保留 to, 常见形容词;
愿意三高兴， 一个备着急。
2、在 love, like, mean, hope, advise, expect, want, persuade, refuse, wish, seem等动词后保留 to.
1)-- Would you like some bananas?
-- Yes, I’d love to.
动后保留to, 有爱莫拒绝;
愿喜似期希，想劝提建议。
3、在 have, need, ought, be able, be going, used等动词后保留 to.
1)I didn’t want to go there, but I had to.
2) We get on pretty well. Better than we used to.
情态常带 to,过去不得不;
需要是另类，应将能力住。
4、在 ask / tell / advise / persuade / wish / permit / allow + sb + to do sth结构中保留 to.
1)Don’t touch anything unless your teacher tells you to.
动后带 to作宾补,请叫建议和告诉;
但愿也留两允许, 勿忘一个要劝服。
