句子的分類:由句子結構來講，可分為三類簡單
一、簡單句：由一個主語(或并列主語)和一個謂語（或并列謂語）構成的句子。
eg. We cleaned the windows and tidied the room.
二、并列句：由并列連詞and, but,so,or,for等把兩個或兩個以上的簡單句連起來的句子。 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、復合句
A.賓語從句：賓語從句在復合句中作主句的賓語，引導賓語從句的關聯詞有that, if/whether, what, who, whose, which, why, when, where, how等。
1、連接詞 1)由連接詞that引導陳述句，在口語中that常省略。
eg. He said that he would like to see the headmaster.
2)由連接詞whether/if引導一般疑問句，whether和if 常可互換，但下列場合一般用whether.
①介詞后的賓語從句：I’m thinking of whether he’ll come.
②與or not連用：I don’t know whether I should go or not.
3)由連接代詞what,who(whom,whose)which或連接副詞when,where,why,how引導特殊疑問句。 eg. Do you know who/whom she is waiting for?
2、語序：不管賓語從句是陳述句、一般疑問句或特殊疑問句，都要用陳述句語序，也就是說主謂次序不能顛倒。連接詞＋主謂結構
(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、時態：一般說來，主從句時態要統一。如果主句是一般現在時，從句可根據需要用其它任何時態；如果主句是一般過去時，從句應該用相應的過去時態范疇（也就是用一般過去時，過去進行時，過去將來時，過去完成時）。
eg.①Lily wanted to know whether her grandma liked the handbag. ②I asked the teacher where we would have the meeting. ③Could you tell me how I can get to the zoo?
如果從句表明的是一個客觀事實或真理，那么無論主句是什么時態，從句都只能用一般現在時。 eg. The teacher told us that light travels much faster than sound.
注意：在think后的賓語從句，如果需要表示否定意義，一般不在賓語從句中否定，而是在主句中否定。 eg. I don’t think that English is easy. I think that English is not easy. ( 誤)
練習題：（一）
①How does he get on with his new classmates? Could you tell me? (改為含有賓語從句的復合句) Could you tell me how ____ _____ on with his new classmates?
②What is he doing there? Mother didn’t know. (改為含有賓語從句的復合句)
Mother didn’t know what _____ ______doing there.
③Could you tell me ________ they are talking about? A.where B.when C.why D.what
④You’d better ask your mother whether is it cheap enough before you try it on.
⑤Excuse me.Could you tell me where ___________?
A.is the toilet B.the toilet is C.was the toiletD.the toilet was
