They advised me to give up smoking. They advised me __n_o_t _t_o_ _gi_v_e __u_p__ smoking. He promised to take care of the poor
He promised _n_o_t _to_ _t_a_k_e _c_a_re_o_f_ the poor
I warned the patient not to eat cold water after the operation. 宾补
作主语
1.帮助你是我们的职责。
_T_o__h_e_l_p_y_o_u____is our duty.
2. 放弃吸烟是对的。
_T_o__g_iv_e__u_p_s_m__o_k_in__g__is right= It is right to give up smoking.
2. I’m pleased to have been given this chance.
如果不定式的逻辑主语是不定式所表 示的动作的承受者，不定式要用被动 形式.
小结
语态 时态 一般时
主动语态
to do
被动语态
to be done
进行时
to be doing
/
完成时
to have done
to have been done
决定想做计划需要同意，能做被用来做的事
decide to do sth.
决定做某事
want ∕ would like to do sth. 想做某事
plan to do sth.
计划做某
need to do sth.
需要做某事
agree to do sth.
同意做某事
afford to do
能做某事
2. It’s wise/kind of him to help the poor.
Step 4 不定式的用法
To do like that is foolish. 主语 I want to see you this evening. 宾语
All you have to do is to finish it quickly. 表语 We found a house to live in. 定语 She came here to study English. 状语
abroad last week. 5. All the students in our class have entered for the
sports-meeting __________ (hold) next week.
Step 3 不定式的复合结构
1. It’s important for us to learn English well.
动词不定式
动词 + to do
作 宾
常见动词有 afford, agree, arrange, ask,
decide, demand, plan desire, expect, hope, learn, manage, offer, pretend, promise,
语
refuse, wish, prefer, happen, intend, fail等
不定式短语作主语时，如果主语如果太长，常用it 作形式主语，真正的不定式主语后置。
作主语
一般用不定式做主语的句型
It +be +adj./n. + for sb. to do sth/ of sb to do sth It +take +sb +time + to do sth It +cost +sb +money + to do sth 。
M5 Unit1 Grammar
本节课重点提要
1. 不定式的基本形式和否定形式 2. 不定式的时态和语态 3. 不定式的复合结构 4. 不定式的基本用法 5. 不定式中常见的主动表被动 6 不定式的省略，保留符号to 7. 不带to的不定式
Step 1 基本形式和否定形式 肯定式: to do 否定式: not to do
练习
1. Hello! It’s good __________ (see) you again. 2. Bye-bye, I’m glad _______________ (see) you. 3. They pretend _____________(work) hard when
the teacher came in. 4. The girl students is said _____________ (send)
动词+疑问词 + to do
I don’t know what to do ve等) + it+宾补 +to do
I find it important to learn English.
只能接不定式作宾语的动词口诀：
决定想做计划需要同意，能做被用来做的事 迫不及待下决心做过去常常未能做的事
在进行。
They seemed to be talking about something secret when I came in.
㈢. 完成式（to have done/to have been done)
如果不定 式的动作 发生在谓 语之前。
1. You seemed to have read the novel written by Mr. Smith.
be used to do
被用来做
迫不及待下决心做过去常常未能做的事
can’t wait to do 迫不及待地要做某事
make up one’s mind to do 下决心做某事
used to do
过去常常做某事
fail to do
Step 2 动词不定式的时态和语态 ㈠. 一般式( to do /to be done).
不定式的一般式所表示的 动作（状态）同时（或几 乎同时）发生，或之后发
生。
I opened the door to enter the room.
㈡.进行式( to be doing)
如果谓语表示的动作 （情况）发生时，不 定式所表示的动作正