賓語從句是名詞性從句的一種。在主從復(fù)合句中充當(dāng)賓語，位于及物動(dòng)詞、介詞或復(fù)合謂語之后的從句稱為賓語從句。如I didn’t know (that) he was Li Lei.?

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(huì)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，不能省；并且它一般不能引導(dǎo)介詞的賓語從句，但可引導(dǎo)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(bǔ)足語成分時(shí)，一般須用it作形式賓語，把賓語從句放到句末，此時(shí)的that不能省。如：
The boy has made it clear that they can’t play with his toys. 那個(gè)男孩已清楚的表明他們不能玩弄他的玩具。
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3. 動(dòng)詞advise, ask, demand, desire, insist(堅(jiān)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(diǎn)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(fèi)時(shí)間了。
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4. 賓語從句的時(shí)態(tài)與主句的時(shí)態(tài)須呼應(yīng)。
1)當(dāng)主句謂語動(dòng)詞的時(shí)態(tài)是現(xiàn)在時(shí)或?qū)頃r(shí)，從句的謂語動(dòng)詞可用任何所需要的時(shí)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(dāng)老師知道我們所干的事情時(shí)，他會(huì)說我們做了一件好事。
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2)當(dāng)主句謂語動(dòng)詞的時(shí)態(tài)為過去時(shí)，從句的謂語動(dòng)詞須用響應(yīng)的過去時(shí)。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(dāng)從句的內(nèi)容是客觀真理或客觀事實(shí)，而不受時(shí)間的限制時(shí)，即使主句謂語動(dòng)詞為過去時(shí)，從句仍用一般現(xiàn)在時(shí)。
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(shí)候，人們就告訴我們說中國在世界的東方。