1.作及物动词宾语
I can’t imagine how he did it.我不能想象，这件事情他是怎么干的。
They couldn’t understand why I refused.他们不能理解我为什么拒绝了。
2.作介词宾语
It all depends on how we solve the problem.这完全要看我们如何解决这问题。
He was deeply displeased by what had occurred that day.
他对那天发生的事感到很不快。
【提示】 介词后面的宾语从句只能用whether 而不用if引导。
3.作形容词宾语
I wasn’t sure who was going to speak.我不敢肯定谁要发言。
She was not aware how dangerous it would be.她并不知道该有多么危险。
【提示】 宾语从句的语序需用陈述句语序。