表语从句是英语语法中的重要概念,通常由连词和关系代词引导。连词包括"that"用于连接陈述句,"whether"用于连接选择,"if"表示条件。关系代词如"who"和"whom"用于描述人,"that"可用于描述人或物。表语从句连接词的正确使用对英语语法和交流至关重要。
连词
- that
这是最常见的表语从句连接词,用于连接陈述句和表语从句,如:
-
My belief is that honesty is the best policy.(我的信念是诚实是最好的策略。)
-
The fact is that he didn't study hard enough.(事实是他没有用功学习。)
- whether
这个连接词用于连接两个选择,如:
-
I don't know whether I should go to the party or not.(我不知道我该不该去参加派对。)
-
She asked me whether I had finished my homework.(她问我是否完成了作业。)
- if
这个连接词用于表示条件,如:
-
The problem will be solved if we work together.(如果我们合作,问题就会得到解决。)
-
I'm not sure if he will come to the party.(我不确定他是否会来参加派对。)
关系代词
- who
这个关系代词用于描述人,如:
-
She is the girl who won the first prize in the competition.(她是那个在比赛中获得第一名的女孩。)
-
He is the man who I saw at the park.(他是那个我在公园里看到的男人。)
- whom
这个关系代词也用于描述人,但通常用于被动语态中,如:
-
The boy whom I helped yesterday is my neighbor.(昨天我帮助的那个男孩是我的邻居。)
-
The woman to whom I gave the book is my teacher.(我送书给的那个女人是我的老师。)
- that
这个关系代词可以用于描述人或物,如:
-
This is the book that I borrowed from the library.(这是我从图书馆借来的书。)
-
The car that he bought last year is very expensive.(他去年买的那辆车非常贵。)