forget to do 忘记要做某事
forget doing 忘记做过了某事 remember to do 记得要做某事
remember doing 记得做过了某事 stop to do 停下（某事）去做某事 stop doing 把某事停下来
go on doing 继续做同一件事
go on to do
1作主语
To find out who stole the money is not easy. It’s not easy (for you )to find out who stole the money.
不定式的复合结构 :for sb to do,
of sb to do It is useful for you to learn some spoken English.
2作宾语
I’m preparing to take the examination next week. （1）只接to do 作宾语的动词
attempt, afford, agree, arrange, beg, choose, decide, determine, expect, hope , intend , long, manage, offer, plan, pretend, prepare, promise , refuse seek, wish, want 等 Nhomakorabea 3作表语
不定式，动名词作表语多说明主语的内 容，不定式常说明具体的一次行为， 动 名词多表抽象习惯 分词：
现在分词：令人…的
过去分词：感到…的
My job is to teach/teaching you English. She looked disappointed. The news is very disappointing.
(3)即可接 to do 又可接doing ，但意义区 别不大的词有：like, hate, begin, start, love, continue等．
．
注意:start, begin后面接to do和doing无多大区
别。但在下列情况下，多用动词不定式： a．表自然界变化：It started to rain. Snow started to melt as spring came. b. 接表心理活动的词，如understand, know, realize等 I began to realize my mistakes. c. begin, start本身为进行时：
主动语态
被动语态
现动 一般 doing being done 在名 式 分词 完成 having done having been 式 done 词 done \ 过去分词
动名词 主语
动词不定 式
分词
宾语
表语 定语 状语 补语
不定式多表具体的动 作，动名词多表抽象 习惯的动作
（1）不定式做主语
不定式作主语时,谓语用单数，为了平衡句子, 通常用it作形式主语,构成句型: It’s +n.(adj.)+ for(of) sb. +to do sth.
regret to do
继续做另一件事 遗憾地要做某事
regret doing 后悔做了某事 can’t help to do 不能帮助做某事 can’t help doing 情不自禁做某事
(5)need, require, want译作“需要”时， 跟doing作宾语，主动表被动，相当于to be done. The classroom needs cleaning/to be cleaned
（2）只接doing动名词作 宾语的动词
allow, mind, miss, enjoy, escape, conside（考虑）, admit(承认)， advise, appreciate，avoid, finish, practise, suggest, delay（延迟）, imagine, keep, quit（离开）, resist(抵抗), risk（冒险）, be used to, look forward to（期望）, object to（反对）, pay attention to, 等
eg. It’s worthwhile doing it. It’s no use doing it.
It’s a waste of time doing it
. ．
(2)动名词做主语时，it也可作形式主语．用于这种 形式的是一些特定的adj和n，但较少,如 worthwhile, worth, useless, no use, no good, fun, a waste of time等
It is very kind of you to come here. It is foolish of him to do such a thing.
在某些形容词如clever, good ,nice, kind ,foolish, careless, right, wrong, rude, impolite等词之后的不定式前，常加of短语,这 是对人做某事的赞扬，责备或感激等。
人教版 Book 7 Unit 3 语法 1课时
动词不定式的基本形式
主动语态
一般式 完成式 进行式 to do to have done to be doing
被动语态 to be done
to have been done \ \
完成进行式 to have been doing
分词/动名词的基本形式
People are beginning to take some measures to stop pollution.
(4)有些动词后可接to do或doing，但意义 截然不同。
try to do try doing
尽力去做某事 试一试，试试看
mean to do 打算做某事
mean doing 意味着做某事
(6)介词but/ except 表除了，其前有实义动词
do时，but / except后的不定式to要省略，否则 to则不省.我们用一句话概括就是：
有do无to，有 to无 do．
She has no choice but to wait He could do nothing but wait.