表语从句中哪些词可以充当表语

　　表语从句中常由名词、代词、数词、动词过去分词、动词的-ing形式、副词、介词短语、形容词、不定式和从句等来充当表语。

　　一、表语从句定义

　　从句在主从复合句中作表语，则称之为表语从句。表语主要用于修饰主语，构成主系表结构，删除后句子结构意义皆不完整。延伸为表语从句时，也是用于修饰主语，不可删去。注意表语从句的语序为陈述语序。

　　The discussion is how we can solve the problem. 讨论内容是我们如何解决这个问题。(how引导表语从句)

　　二、表语从句重点理解

　　1用来说明主语的身份、性质、品性、特征和状态。

　　2常由名词、代词、数词、动词过去分词、动词的-ing形式、副词、介词短语、形容词、不定式和从句等来充当。

　　比如以下的句子中表语可以由各种成分充当：

　　① The boy talked you just now is my classmate. (名词充当表语)

　　② I didn’t know that it was you at that time. (代词充当表语)

　　③ The window remained closed. (动词-ed充当表语)

　　④ My mother’s daily job is cleaning the house. (动词-ing充当表语)

　　⑤ The house is not only clean but also beautiful. (形容词充当表语)

　　⑥ When I went to your house, you were out. (副词充当表语)

　　⑦ No one was in the room, when he arrived. (介词短语充当表语)

　　⑧ My job is to teach you Chinese. (不定式充当表语)

　　⑨ The reason why he came late was that he had a stomachache. (从句充当表语)

　　三、表语从句语句实例

　　1 The only problem is that the table is too big for your room.

　　唯一的问题是，这桌子放在你的的房间里太大了。

　　(is+表语从句that the table is too big for your room. )

　　2 The question is how she did it.

　　问题是，她是怎么做到的。

　　3 The reason is that they were stuck in a traffic jam for hours.

　　原因是，他们塞车塞了好几小时。

　　四、(英语语法)表语从句关联文章

　　1 英语语法之表语从句用法详解(例句丰富)

　　2 表语从句定义及充当表语词详解(带例句和解释)

　　3 表语从句四部分结构详解(带具体词组和例句)

　　4 表语从句引导词-连词详解(带词义和例句)

　　5 表语从句引导词-连接代词和连接副词详解(带词义和例句)

　　6 表语从句中because与why、the reason、that注意项详解(带例句)

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