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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。 | 
