判断表语从句如下:
表语从句的构成方式:若从句为陈述句,直接加that;若从句为特殊疑问句:直接保留特殊疑问词,后面的句子变成陈述句语序;若从句为一般疑问句:先把一般疑问句变成陈述句语序,然后在其前加上weather或者if;
eg:China is no longer what she used to be.
The question is who is responsible for what has happened.
拓展资料:
表语从句引导词的用法:
1. that引导的表语从句
(1) that 在从句中仅起连接作用,无实际意义,在句中不做任何成分,不能省略。
例:
My opinion is that it’s getting better and better.
(2)在表 “建议,劝说,命令” 的名词idea,suggestion,request,proposal后面的表语从句中,谓语动词用“should + 动词原形”,should可省略。
例:My suggesstion is that we (should) start early tomorrow.
2. whether 在表语从句中表“是否”,但不充当句子的成分。if不能引导表语从句。
例:The question is whether it is worth doing.
3. what 在表语从句中充当主语、宾语或表语,表示什么,什么样子,或所…的(人或事)。
例:The question is what caused the accident.
4. who 在表语从句中充当主语、宾语或表语,表示“谁”.
例:The problem is who could do the work
5. which 在引导表语从句时,常充当定语,表语。表示“哪一个,哪一些”。
例:I read about it in some book or another,but what I don’t know is which (book) it is.
6. 由as if,as though引导表语从句,表示“好像”。句子中的系动词常用be, look, appear, seem,sound等。
例:It looksas if it is going to rain.
The young man with long hair looks as if he were a girl. (虚拟语气)
7. 当主句的主语为reason,或者是由 why 引导的从句时,与它们相关的表语从句用 that 来引导,而不能由 because 引导。because 引导表语从句时只能用于It/That/This is /was because…句型中。
例:The reason why I was late was that I missed the train.
I was late. It/That/This was because I missed the train.
8. 当表语从句中主语、宾语、表语具备,但还是要表示疑问含义,可以判断句子中缺少状语,常常用相应的特殊疑问词引导,有why,when,where,how 等。
例:This is how he did it.
That is why the brothers wanted to make a bet.
That’s why we’ve given you the letter.