宾语从句顺口溜口诀和用法[宾语从句歌诀] 宾语从句三姊妹，that，if/whether，wh-/how展风采。
展风采有三关，引导词、语序、时态在把关。
主从时态要遥，陈述语序永不变。
陈述请你选that，疑问需用if/whether连。
特殊问句作宾从，原来问词不用换。
三关过后莫得意，人称、标点需注意。
留意变脸的if/when，从句的简化记心间。
-------------------------------------------- [歌诀遥] 一、三姊妹 宾语从句根据引导词的不同可分为三种类型： 1.
由that引导的宾语从句。
如： We knew (that)we should learn from each other.
2.
由if/whether引导的宾语从句。
如： Please tell me if/whether you have been to America.
3.
由who，where，how等连接代词或连接副词引导的宾语从句。
如： Can you tell me how I can get to the nearest post office?
二、三关 1.
引导词关 如果从句是陈述句，引导词用that(that在口语或非正式文体中常省略);如果从句是一般疑问句，引导词用if/whether;如果从句是特殊疑问句，引导词用由疑问词转换而来的疑问代词/副词。
2.
语序关 ①陈述句变为宾语从句，语序不变，即仍用陈述语序。
如： He is an honest boy.
The teacher said.
→The teacher said(that)he was an honest boy.
②一般疑问句和特殊疑问句变为宾语从句，语序变为陈述语序。
如： Does he work hard?
I wonder.
→I wonder if/whether he works hard.
When did he leave?
I don’t know.
→I don’t know when he left.
3.
时态关 ①如果主句是遥的时态，从句的时态可根据实际情况而定。
如： I have heard(that)he will come back next week.
②如果主句是过去的某种时态，那么从句的时态一定要用过去的某种时态。
如： He said(that)there were no classes yesterday.
注意：如果宾语从句表述的是客观真理、自然现象等时，不管主句是什么时态，从句都要用一般遥时。
如： He said that light travels much faster than sound.
三、人称的变化和标点的遥 1.
从句的主语如果是遥称，变为宾语从句则与主句的主语遥;如果是第二人称，则与主句的宾语遥;如果是第三人称，不用变化。
如： “May I use your knife?
”He asked me.
→He asked me if he might use my knife.
“Do you know her telephone number?
”He asked me.
→He asked me if I know her telephone number.
2.
宾语从句的标点均由主句决定。
主句是陈述句，用句号;主句是疑问句，用问号。
如： Who will give us a talk?
I don’t know.
→I don’t know who will give us a talk.
Do you know?
Where does he live?
→Do you know where he lives?
四、两副面孔 if和when既能引导时间状语从句，又能引导宾语从句。
因此，遇到它们就要认真分析一下，它们究竟属于“两副面孔”的哪一副。
如： If it rains tomorrow，I won’t come.
(时间状语从句) I don’t know if it will rain tomorrow.
(宾语从句) 五、从句的简化 1.
当主句谓语动词是find，see，watch，hear等感官动词时，从句常简化为“宾语+宾补”结构，宾补为不带to的不定式或V-ing形式。
如： She found that the wallet lay/was lying on the ground.
→She found the wallet lie/lying on the ground.
2.
当主句谓语动词是hope，wish，decide，forget，plan，agree等，且主句主语与从句主语相同时，从句可简化为不定式结构。
如： She agreed that she could help me with my maths.
→She agreed to help me with my maths.
3.
在连接代词/副词引导的宾语从句中，当从句主语与主句主语或间接宾语遥时，宾语从句可简化为“连接代词/副词+不定式”结构。
如： Can you tell me how I can get to the station?
→Can you tell me how to get to the station?