4. 用于被动语态，相当于can / could / should / ought to / must，具有情态意义 He is to be rewarded. 他应该受到奖励。（should） These books are not to be sold. 这些书不应该卖掉。 （ought not to be） 5. 表示“同意、安排、命令、决定、劝告、意愿、 禁止”等 Children are not to smoke. 儿童不准吸烟。（禁止）
3. 同位关系 不定式与所修饰的名词指的是一回事。 We have made a plan to learn from Lei Feng. 我们做 了个学习雷锋的计划。 4. 状语关系 被修饰的名词表示动词不定式动作的方式、时间等。 I have no time to go there. 我没有时间去那里。 二、动词不定式作主语 1. 可位于句首 To learn English is very important for everyone in modern society. 在现代社会，学习英语对每个人而言都 很重要。
importance of environment. working
10. There are many robots ____________(work) in
factories nowadays.
二、选择填空
( D )1. For more than once, our head teacher asks us _______the habit of keeping a diary. (2017广东)
三、动词不定式作表语 1. 表示目的 The purpose of education is to develop a fine personality in children. 教育的目的是发展儿童良好的品 格。 2. 表示事态发展的结果、预期的结果、不幸的命运等 You are to die at ninety eight. 你会在98岁时去世。 3. 用于含有第一人称的疑问句，表示征求意见 What am I to do if I have no money? 如果没有钱，我 该怎么办呢？
三、语法填空 Have you ever thought of studying abroad? It has
been very popular these years for Chinese young people 1. __t_o__s_tu_d_y__(study) abroad. But it can also be a difficult experience. You had better 2. _r_e_m_e_m__b_e_r_(remember) the following things. When you are in a foreign country, the first thing 3. __t_o__d_o____(do) is to learn the language. Because practice makes perfect, you need to practise 4. _s_p_e_a_k_i_n_g__(speak) their language a lot. 5._D__o_n_’t_b__e_ (not be) shy and you may improve your spoken language.
Second, remember to be ten times more polite than 6. ___u_s_u__a_l _____(usually). People are likely to help you 7. __i_f__you are nice and polite. I have a brother named Eddy. His dream is 8. ___to__g_o___(go) abroad. He plans to study art in France. My parents support him a lot. Eddy will set out for France next September to learn art in Paris. I am worried 9. ___a_b_o_u_t__him. He has never left home. So I asked him to remember my advice and try his best to take care of 10. ___h_i_m_s_e_l_f___.
九年级 全一册 配上海教育版
●上册● Module 1 Geniuses
Unit 2 Great minds
第3课时 Grammar
语法聚集
动词不定式 动词不定式动词不定式是由“不定式符号to+动词原形” 构成的一种非谓语动词结构。 一、动词不定式作定语 动词不定式作定语，一般都是作后置定语，修饰前面的名 词或代词。 动词不定式与所修饰词之间的关系: 1. 主谓关系 被修饰的名词或代词实际上是不定式的逻辑主语。
A. develop
B. develops
C. developinnever we kids come over, Auntie Susan just stands there and watches us _______ sure we don't break anything. (2017河南)
5. He kept __e_x_e_r_c_is_i_n_g__(exercise) so that he could be
in good health.
6. John went to bed last night without his homework
___d_o_n_e______(do).
We need some students to help with the work. 我们需 要些学生来帮助完成工作。（students will help with the work） 2. 动宾关系 被修饰的名词或代词是动词不定式的逻辑宾语。 若该不定式为不及物动词，其后须加上适当的介词。 I have many documents to type. 我有很多文件要录入。 （to type many documents） I am looking for a room to live in. 我正在找房子住。 （to live in a room）
7. The best time __t_o_p_l_a_n_t____(plant) trees is in March.
8. Take it easy. I'll do what I can __t_o__h_e_lp_____(help)
you.
to make
9. Her aim is ____________(make) everyone realize the
2. 用it作形式主语，而将不定式置于句末 常见句型有：（1）It is＋adj.（＋for sb.／sth.）＋to do sth. （2）It is＋adj.＋of sb.＋to do sth. （3）It takes sb.＋some time＋to do sth. It is necessary for children to have the habit of reading. 对孩子们而言，拥有阅读习惯很有必要。 It is friendly of you to make me feel at home. 你真友好， 让我感觉像在自己家一样。 It took us half an hour to drive to the countryside. 我们 花了半小时开车到乡下。
课堂练习
一、用所给单词的适当形式填空 1. It's interesting ___to__p_la_y__(play) with snow in winter. 2. It takes the boy two hours __t_o_d_r_a_w__(draw) every day. 3. I'm so hungry. Please give me something __to__e_a_t_ (eat). 4. The only thing you can do is __t_o_s_t_u_d_y__(study) harder than before.
A. make
B. made
C. to make
D. making
( D )3. —Jack, why have you decided ________ Chinese folk music as a course? —To learn more about Chinese culture. (2017苏州) A. take B. taken C. taking D. to take ( B )4. —Mario, your mobile phone is ringing. —Wait a minute. It's dangerous for us ________ it while crossing the street. (2017南充) A. answering B. to answer C. answer D. answered ( A )5. As a volunteer, the girl wants to visit sick kids in the hospital ________ them up. (2017青岛) A. to cheer B. cheer C. cheering D. cheered