賓語從句是名詞性從句的一種。在主從復合句中充當賓語，位于及物動詞、介詞或復合謂語之后的從句稱為賓語從句。如He asked what you were doing last night.?

用來充作賓語的句子叫做賓語從句。如：
He asked what you were doing last night. 他問你昨天夜晚在干什么。
I didn’t know that he was wounded in the accident. 我原來不知道他在那事故中受了傷。
Can you explain why he didn’t come to the party last Sunday?? 你能解釋上周星期日他為什么沒有來參加聚會嗎？
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在賓語從句中須注意：
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1. that 在口語中常被省略，但在正式的文體中，不能??；并且它一般不能引導介詞的賓語從句，但可引導except, but, in 等少數(shù)介詞的賓語從句。如：
I didn’t know (that) he was Li Lei. 我不知道他就是李蕾。
I will do anything I can to help you except that I’m ill. 只要我身體舒服，我愿做任何事情來幫助你。
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2. 賓語從句之后帶有補足語成分時，一般須用it作形式賓語，把賓語從句放到句末，此時的that不能省。如：
The boy has made it clear that they can’t play with his toys. 那個男孩已清楚的表明他們不能玩弄他的玩具。
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3. 動詞advise, ask, demand, desire, insist(堅決主張), order, propose, request, suggest(建議)等代的賓語從句須用虛擬語氣，即：(should) do的形式。
He asked that we (should) get there before nine o’clock. 他要求我們在九點鐘之前趕到那兒。
The teacher advised us that we (should) not waste our time. 老師勸告我們不要浪費時間了。
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4. 賓語從句的時態(tài)與主句的時態(tài)須呼應。
1)當主句謂語動詞的時態(tài)是現(xiàn)在時或?qū)頃r，從句的謂語動詞可用任何所需要的時態(tài)表示。如：
He always says that he is our good friend. 他總是說他是我們的好朋友。
When the teacher knows what we have done, he will say that we have done a good deed. 當老師知道我們所干的事情時，他會說我們做了一件好事。
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2)當主句謂語動詞的時態(tài)為過去時，從句的謂語動詞須用響應的過去時。如：
He didn’t tell us he came from Shanghai. 他沒有告訴我們他來自上海。
He said he had read the book. 他說他讀過這本書。
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3)但當從句的內(nèi)容是客觀真理或客觀事實，而不受時間的限制時，即使主句謂語動詞為過去時，從句仍用一般現(xiàn)在時。
Chairman Mao said that all the imperialists are paper tigers. 毛主席說一切帝國主義者都是紙老虎。
When we were children, we were told that China is in the east of the world. 我們還是小孩子的時候，人們就告訴我們說中國在世界的東方。