賓語(yǔ)從句是名詞性從句的一種。在主從復(fù)合句中充當(dāng)賓語(yǔ)，位于及物動(dòng)詞、介詞或復(fù)合謂語(yǔ)之后的從句稱為賓語(yǔ)從句。賓語(yǔ)從句分為三類：動(dòng)詞的賓語(yǔ)從句，介詞的賓語(yǔ)從句和形容詞的賓語(yǔ)從句。

1. 賓語(yǔ)從句的連接詞

（1）從屬連詞that, if, whether
需要注意區(qū)分的是：that引導(dǎo)表示陳述句的賓語(yǔ)從句，if和whether引導(dǎo)表示“是否”的一般疑問(wèn)句的賓語(yǔ)從句。例如：
He told me that he would go to the college the next year.
他告訴我他明年上大學(xué)。
I don't know if there will be a bus any more.
我不知道是否還會(huì)有公交車(chē)。
Nobody knew whether he could pass the exam.
沒(méi)有人知道他是否會(huì)通過(guò)考試。
（2）連接代詞who, whom, whose, what, whoever, whomever, whosever, whatever, whichever
需要注意的是：連接代詞一般指疑問(wèn),但what, whatever，whichever 除了指疑問(wèn)外，也可以指陳述。例如：
Do you know who has won Red Alert game?
你知道是誰(shuí)贏得了紅色警戒的游戲么？
The book will show you what the best CEOs should know.
這本書(shū)會(huì)告訴你最好的執(zhí)行總裁該了解什么.
Have you determined whichever you should buy, a Galaxy Note 7 or iPhone 7?
你決定好是買(mǎi)三星7還是iPhone 7了嗎?

2. 哪些賓語(yǔ)從句不可以省略引導(dǎo)詞that

（1）表達(dá)人主觀意見(jiàn)的動(dòng)詞
add, agree, announce, argue, assume, complain, decide, hold, indicate, insist, intend, learn, promise, point out, remark, suggest, state 等之后的賓語(yǔ)從句的引導(dǎo)詞that需保留。例如：
I complained that I had been unfairly treated.
我抱怨說(shuō)自己受到了不公平的對(duì)待。
（2）及物動(dòng)詞+兩個(gè)及以上賓語(yǔ)從句
及物動(dòng)詞后跟有兩個(gè)或兩個(gè)以上的賓語(yǔ)從句時(shí)，最后一個(gè)從句的that不可省略。例如：
I realize that I'm in charge and that everybody accepts my leadership.
我意識(shí)到要對(duì)這一切負(fù)責(zé)，并且每個(gè)人都要聽(tīng)從我的領(lǐng)導(dǎo)。
（3）動(dòng)詞+雙賓語(yǔ)
當(dāng)動(dòng)詞后跟有復(fù)合賓語(yǔ)結(jié)構(gòu)時(shí)，it作形式賓語(yǔ)，that從句作真正賓語(yǔ)，引導(dǎo)詞that不可省略。例如：
We consider it an honor that we can have the pleasure of serving you.
為您效勞真是我們的榮幸。
（4）出現(xiàn)插入語(yǔ)
當(dāng)動(dòng)詞和that從句之間有插入語(yǔ)時(shí)，that不可省略。例如：
The secretary said, pleasantly and sternly, that our thinking was too slow to suit the needs of modern society.
書(shū)記語(yǔ)重心長(zhǎng)地說(shuō)，我們的思維已落后于現(xiàn)代社會(huì)的需求。
（5）狀語(yǔ)緊跟that
當(dāng)that從句的狀語(yǔ)緊跟在that之后時(shí)，that不可省略。例如：
They told us that once again the situation was serious.
They told us once again that the situation was serious.
他們?cè)俅胃嬖V我們情況十分嚴(yán)重。