宾语从句通常由连词that和whether (if)、连接代词或连接副词以及关系代词型what引导。如：
We believe that he is honest. 我们相信他是诚实的。
I dont know whether hell arrive in time. 我不知道他是否能及时到。
I dont know who [whom] you mean. 我不知道你指谁。
He asked why he had to go alone. 他问他为什么必须一个人去。
Please tell me which you like. 告诉我你喜欢哪一个。
She has got what she wanted. 她要的东西得到了。
注意，有时介词后可接一个宾语从句(但介词后通常不接that和if引导的宾语从句)。如：
From what you say, he is right. 根据你所说的，他是对的。
有极个别介词(如but, except)可接that引导的宾语从句。如：
She remembered nothing about him except that his hair was black. 她对他什么都不记得，只记得他的头发是黑的。