在英语主语从句中,"that"可以在某些情况下省略,使句子更简洁。当谓语动词是"be"、"think"、"believe"、"suppose"、"hope"、"guess"、"expect"、"find"、"feel"、"make"、"hear"、"see"等时,可以省略"that"。但在谓语动词是除上述之外的其他动词,或主语从句中有特殊词如whether、if、as、than等时,不能省略"that"。
可以省略that的情况
- 当主语从句中的谓语动词是"be"时,可以省略"that"。 例如:
- It is necessary that you attend the meeting. (必须参加会议。)
- It is necessary you attend the meeting. (必须参加会议。)
- 当主语从句中的谓语动词是"think"、"believe"、"suppose"、"hope"、"guess"、"expect"等时,可以省略"that"。 例如:
- I believe that he is telling the truth. (我相信他在说真话。)
- I believe he is telling the truth. (我相信他在说真话。)
- 当主语从句中的谓语动词是"find"、"feel"、"make"、"hear"、"see"等时,可以省略"that"。 例如:
- I find that movie boring. (我觉得那部电影很无聊。)
- I find the movie boring. (我觉得那部电影很无聊。)
不可以省略that的情况
- 当主语从句中的谓语动词是除了上述动词以外的其他动词时,不能省略"that"。 例如:
- He said that he would come. (他说他会来。)
- He said he would come. (他说他会来。)
- 当主语从句中有一些特殊的词时,不能省略"that",这些词包括:whether、if、as、than等等。 例如:
- I don't know whether he will come or not. (我不知道他会不会来。)
- I don't know if he will come or not. (我不知道他会不会来。)