用一個句子充當賓語的叫賓語從句。賓語從句在復合句中作主句的賓語。下面是小編收集整理的賓語從句知識點，歡迎閱讀。
1.由that引導，由于that沒有任何意義，也不充當任何句子成分。因此that在非正式文體中可以省略。這類賓語從句通常表達一種陳述意義。
e.g.He told me (that) he would go to Wuhan.
Tom says (that) he must study hard.
She told me (that) she was a student.
(1)如果由and連接兩個并列的賓語從句時，第二個that則不能省略。
e.g.She said she liked English very much and that she didn’t like math at all.
(2)常接that引導的賓語從句的謂語動詞有：believe, expect, explain, feel, hear, hope, imagine, prefer, promise, report, say, see, tell, think, understand, warn, wish等。
2.由連接代詞或連接副詞who, whose, what, which, when, where, how, why引導，含有“誰、什么、哪個、什么時候、什么地方、怎樣、為什么”等特殊疑問意義。
e.g.Do you know who they’re talking about?
Can you tell me what they’re looking for?
I don’t know where she has gone.
I wonder how she can find us.
She didn’t tell me where her hometown was.
3.由從屬連詞whether和if引導，含有“是否，能否，對否，有否”等一般疑問意義。
e.g.She asked me if I could help her.
Jim wanted to know whether I had taken his English book.
Please tell me whether you can come or not.
在這類賓語從句中要注意兩點：
(1)if引導賓語從句和狀語從句的區(qū)別
if引導賓語從句時意為“是否”，從句中該用什么時態(tài)就應用什么時態(tài)。
if引導條件狀語從句時意為“假如”，從句中應用一般現(xiàn)在時代替一般將來時。
e.g.She wanted to know if you were a teacher.
I don’t know if the letter is yours.
They’ll go boating if it is fine tomorrow.
I’ll give it to her if she comes next week.
(2)if引導賓語從句時多數(shù)情況下可以與whether互換，但如果要突出“究竟是……還是不……”這層意思時，通常用whether，并在后面的加上“or not”，即一般要選擇whether構成whether…or not的結構。
e.g.Please find out whether the money is his or not.
Let me know whether you can come or not.
I want to know whether you can help me or not.
注意：
1.賓語從句的語序問題
以上介紹了三種賓語從句，同學們一定要注意，在疑問詞或if/whether引導的賓語從句中，一定要用陳述句語序。
e.g.She asked how old I was.
We don’t know where her office is.
My teacher wanted to know if I like English.
2.賓語從句的時態(tài)問題
一般情況下賓語從句的時態(tài)必須和主句的時態(tài)保持一致：
當主句的謂語動詞是一般現(xiàn)在時時，賓語從句中的謂語動詞不受時態(tài)限制。
e.g.She says that she is a student.
She says that she was a student two years ago.
She says that she will be a college student soon.
She says that she has been a college student for 3 years.
當主句的謂語動詞是過去時時，賓語從句中只能用過去的某種時態(tài)。
e.g.He told me that he would leave soon.
He said that he was watching TV.
He didn’t tell me whether he had finished this homework.
但如果賓語從句中講述的客觀事實、一般真理或自然現(xiàn)象時，則不受它限制。
e.g.My teacher told us that Yangtze River is the longest river in our country.
Father said (that) the sun always rises in the east.
拓展閱讀：賓語從句練習題
( ) 1. It’s so dark. I can’t find out it’s a boy a girl.
A. if, and B. that, and C. either, or D. whether, or
( ) 2. Could you tell me if he to Shanghai?
A. has gone B. had gone C. went D. go
( ) 3. He told me she would catch the early bus.
A. which B. whether C. why D. that
( ) 4. Mrs. Green asked me I would go with her.
A. what B. which C. why D. that
( ) 5. I don’t know the coat cheap enough.
A. if, is B. where, were C. that, was D. if, were
( ) 6. Can you tell me why yesterday?
A. you didn’t come B. did you not come
C. didn’t you come D. you don’t come
( ) 7. He said that they Yunnan.
A. have been to B. had gone to
C. have gone to D. has gone to
( ) 8. Jack isn’t sure students there are in his class.
A. how many B. what C. which D. whether
( ) 9. Can you tell me yesterday?
A. what they do B. what they did
C. what do they do D. what did they do
) 10. I want to know his homework yesterday evening.
A. if he finished B. whether he had finished
C. had she finished D. has she finished
答案1. D 2. A 3. D 4. C 5. A 6. A 7. B 8. A 9. B 10. A