that引导的宾语从句(在非正式场合that可以省略)
可跟that从句做宾语的动词有:
say, think, insist, wish, hope, demand, imagine, wonder, know, suppose, see, believe, agree, admit, deny, expect, explain, order, command, feel, dream, suggest, hear, mean, notice, prefer, request, require, propose, declare, report等。
例句:The boy believes that he will travel through space to other planets.
注意事项:当主句谓语动词是 think, believe, suppose, expect 等词,而宾语从句的意思是否定时,常把否定转移至主句表示。
例句:I don’t think it is right for him to treat you like that.
由whether,if 引导的宾语从句
由whether(if)引导的宾语从句,实际上是一般疑问句演变而来的。意思是“是否”。宾语从句要用陈述句语序。一般说来,在宾语从句中whether与if可以互换使用,但在特殊情况下if与whether是不能互换的。
例句:I wonder whether(if) they will come to our party.
只能用whether,不能用if引导的宾语从句
1、在带to的不定式前
例句:We decided whether to walk there.
2、在介词的后面
例句:I’m thinking of whether we should go to see the film.
3、在动词后面的宾语从句时
例句:We discussed whether we had a sports meeting next week
4、直接与or not连用时
例句:I can’t say whether or not thet can come on time.