句子（三）
四、祈使句：表示请求、命令、建议或劝告等的句子叫祈使句，主语you通常省略。1、祈使句的肯定形式：一般以动词原形开头。 open the door, please.
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.
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. down the street,and you'll see a hospital. 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.
't skate 't skating 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。
一、简单句：由一个主语(或并列主语)和一个谓语（或并列谓语）构成的句子。
eg. we cleaned the windows and tidied the room.
二、并列句：由并列连词and, but,so,or,for等把两个或两个以上的简单句连起来的句子。 eg.
1)i come from china and he comes from japan. 2)hurry up,or you'll miss the train.
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.
三、复合句
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?
2、语序：不管宾语从句是陈述句、一般疑问句或特殊疑问句，都要用陈述句语序，也就是说主谓次序不能颠倒。连接词＋主谓结构
(1).bill wanted to know who did this. (2).i don't know what's the matter with bob?
(3).i don't know what's wrong with them?
3、时态：一般说来，主从句时态要统一。如果主句是一般现在时，从句可根据需要用其它任何时态；如果主句是一般过去时，从句应该用相应的过去时态范畴（也就是用一般过去时，过去进行时，过去将来时，过去完成时）。
eg.①lily wanted to know whether her grandma liked the handbag. ②i asked the teacher where we would h**e the meeting.
③could you tell me how i can get to the zoo?
如果从句表明的是一个客观事实或真理，那么无论主句是什么时态，从句都只能用一般现在时。 eg. the teacher told us that light tr**els much faster than sound.
注意：在think后的宾语从句，如果需要表示否定意义，一般不在宾语从句中否定，而是在主句中否定。 eg.
i don’t think that english is easy. i think that english is not easy. (误)
练习题：（一）
①how does he get on with his new classmates? could you tell me? (改为含有宾语从句的复合句) could you tell me howon with his new classmates?
②what is he doing there? mother didn't know. (改为含有宾语从句的复合句)
mother didn't know whatdoing there.
③could you tell methey are talking about?
④you'd better ask your mother whether is it cheap enough before you try it on.
⑤excuse you tell me where
the toilet toilet is the toilet was
句子（四）四、祈使句：表示请求、命令、建议或劝告等的句子叫祈使句，主语you通常省略。
1、祈使句的肯定形式：一般以动词原形开头。 open the door, please.
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.
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. down the street,and you'll see a hospital. 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.
't skate 't skating 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。
一、简单句：由一个主语(或并列主语)和一个谓语（或并列谓语）构成的句子。
eg. we cleaned the windows and tidied the room.
二、并列句：由并列连词and, but,so,or,for等把两个或两个以上的简单句连起来的句子。 eg.
1)i come from china and he comes from japan.
2)hurry up,or you'll miss the train. 3)he looked for it everywhere, but he couldn't find it.
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