A.宾语从句：宾语从句在复合句中作主句的宾语，引导宾语从句的关联词有that, if/whether, what, who, whose, which, why, when, where, how等。

1、连接词　 1)由连接词that引导陈述句，在口语中that常省略。

　eg. He said that he would like to see the headmaster.

2)由连接词whether/if引导一般疑问句，whether和if 常可互换，但下列场合一般用whether.

　①介词后的宾语从句：I'm thinking of whether he'll come.

　 ②与or not连用：I don't know whether I should go or not.

　 3)由连接代词what,who(whom,whose)which或连接副词when,where,why,how引导特殊疑问句。　 eg. Do you know who/whom she is waiting for?

　 3)He looked for it everywhere, but he couldn't find it.

　 4)She didn't know the answer to the question,so she asked the teacher.

　 5)He's interested in music while John is interested in sports.

　 eg. We cleaned the windows and tidied the room.

3、说话对象是第一人称和第三人称时，表示建议做某事。　　 Let me/us　　 Let him/her/them　 eg. Let's go to school.　　 注意： 1)祈使句 + and/or + 简单句是常用句型

　祈使句 + and + 简单句 表示“如果…，就…”

祈使句 + or + 简单句 表示“…否则…”

eg. 1.Go down the street,and you'll see a hospital.　 2.Be quick,or we'll be late.

　2)在祈使句后面，常常附加一个问句，使语气更加委婉。

　eg.①Tell me about it,will you/won't you?　　 ②Don't tell anyone,will you?

　 ③Let's go to school,shall we?　 ④Let us go out to play for a while,will you?　　　　　　　　　　

　练习题　　 1)_____ on the thin ice. It's dangerous.

　A.Don't skate　 B.Don't skating　　 C.Skate　 D.Not skate

　 2)Let's fly the kite on the playground, _____ ______?(附加问句)

　3)Please turn down the radio a bit, ____ _____?(附加问句)

句子的分类:由句子结构来讲，可分为三类简单

2、祈使句的否定形式：在句首谓语动词前加Don't。　 Don't be late for class.

4. Can you see the stars in the daytime? → Can the stars _____ __in the daytime?　　　　　　　 　

句子(三)

3. You must not put the bike there. → The bike ___ ____ _____there.　　　　　　　　　　

2. They built quite a few tall buildings in their hometown last year.

→ Quite a few tall buildings ___ _____ in their hometown last year.　　　　　　　

1.We use brooms for sweeping the floor. → Brooms___ ___for sweeping the floor.　　　　　

6.You may clean the room after work. → The room may _____ _______ after work.

　 思考题: