如：She told me (that) she had bought a gift for me.
I hope that it will be cooler tomorrow.
常接此类宾语从句的动词有：say, think, hope, tell, see, deny, demand, suggest, propose, declare, feel, intend, insist, believe, agree, admit, expect, explain, imagine, know, report, doubt等
I doubt that he has the ability to do this.
2、what, where, when, which, who, why,
如：I can’t understand why you feel so bitter about her manners.
Could you explain what has caused the delay?
I wonder how you managed to escape.
Just tell me which one you prefer.
可接此类从句的动词有：ask, say, tell, know, wonder, understand, inform, advise, decide, find, answer, suggest, show, discuss, discover等
3、whether /if 引导的宾语从句
whether / if引导的从句，表示“是不是….”，whether /if虽不在从句中担当成分，但因有实质意思，不可省略，之后的从句需要是完整的主谓结构
如：I wonder if /whether you are interested in his paintings.
I can’t decide whether I should go or not. (此时不可以用if)
I am sure that he will come before long.
I’m afraid (that) you are not allowed to enter without a pass.
Almost all economists agree —-by trading with one another.
(A) nations that are gained
(B) nations they gain
(C) gaining nations
(D) that nations gain
讲解：谓语动词agree的宾语不完整, 因agree一词不可以直接与名词词组搭配, 但可接that引导的从句, 故D以外的选项均可排除
A biologist does not merely describe organisms, but tries to learn —-act as they do.
(A) what causes them to
(B) causes them to what
(C) what to cause them
(D) what cause to them
讲解：空格处需要的是动词learn的宾语，B是谓语形式可先排除；因不符合固定词组cause somebody to do, C和D均可排除；A是what引导的宾语从句，符合题意