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表语从句与宾语从句的关系非常的密切；它们是同一类的从句。主、宾、表、同位都属于名词性从句。它们的写法基本相同，位置不同。
定义：一个句子做表语(主系表)。
位置：主 + 系 + 表语从句
结构：系动词 + 连接词 + 句子做表语 = 表语从句 (与宾语从句类似)
|
名词性从句 |
主语 | 实义动词 | 连接词 | 宾语从句 | I knew that my turn had come. |
| 系动词 | 表语从句 | The car is a small toy called a ‘topcar’. | |||
| It 形式主语 | 系表/谓宾 | 主语从句 | At one point, it seemed certain that their plane would crash. | ||
| 主语 | 谓宾 | 同位语从句 | He couldn’t explain the fact that Mary’s wallet was found in his room. |
使用场景
表语从句通常跟在系动词(is/am/are/was/were...)后面，主要用一句话描述、修饰主语。
| 主语 + is that/when/... 什么情况 | |
|---|---|
| 说事 | The most surprising thing is that 最(令人)惊讶的是 I haven't had any water all day. |
| The most interesting thing is that 最(令人)有趣的是 he can't sing. | |
| The most embarrassing thing is that 最(令人)尴尬的是 she forgot to cook. | |
| 建议 | His suggestion is that we should keep calm. |
| 问题 | The question is when he will arrive here. |