不定式的其他问题

1) 不定式的省略
* I shall go if I want to. 如果我想去我就去。
* Will you come? I'd love to. 你来吗? 我愿意来。
* — Would you like to give me a hand？
— I' m happy to．
— 帮我一个忙好吗？
— 可以， 我很乐意
* You don't know her? You ought to. 你不认识她? 你应该认识她。
* "Do you want to give a talk on that subject?" "I prefer not to." "你想就那个题目给大家谈谈吗?""我想不谈为好。"
* The boy wanted to play football in the street，but his mother told him not to．这男孩想在街上踢足球， 但他母亲叫他不要。
* You'd better give a performance if they should ask you to. 如果他们要求你表演一个节目，你最好表演一个。
* Did you get a ticket? No, I tried to, but there weren't any left. 你买到票了吗？ 没有，我去买来着，但卖完了。

2) 并列的不定式
当有两个或两个以上的不定式并列时，通常可只保留第一个不定式的to, 而省列其余不定式的to。
* She decided to remain in the enemy rear and carry on underground work. 她决定留在敌后干地下工作。
* They are taught to read，write and do many other things at school．在学校， 老师教他们读书、写字以及其他很多事情。

注: 对比关系的不定式不能省略to
* He hasn't decided whether to go home or to stay at school during the vacation. 他没决定假期是回家还是留在学校里。
* Wouldn't it be better for her to continue to do this work than to take up something new? 让她继续做这工作，而不另外做新的工作是不是更好一些?

3) 分裂不定式
不定式的动词可以有副词修饰， 即在to和动词之间可插入副词。这种情况称为分裂不定式。
* He prepared to silently accompany her. 他准备默默地陪伴着她。
* I'm sorry to have always been interrupting you. 　　很抱歉我总是打扰你。
* It would take ages to really master this subject. 这门学科需要很多年才能真正掌握。
* I wish the plan to carefully be made for the experiment. 我希望仔细制定这项实验计划。