表语从句表语从句就是用一个句子作为表语。说明主语是什么或者怎么样，由名词、形容词或相当于名词或形容词的词或短语充当，和连系动词一起构成谓语。The problem is puzzling. 这个问题令人困惑。（主语+连系动词+形容词作表语）The problem is when we can get a pay rise.问题是什么时候我们可以得到加薪。（主语+连系动词+句子作表语（表语从句） 连接表语从句的连接词有：that, what, who, when, where, which, why, whether, how, whoever，whomever，whichever ，whatever等。还有如because, as if, as though等。His suggestion is good.His suggestion is that we should stay calm.The question is confusing.The question is when he can arrive at the hotel. 表
