专题五：表语从句 表语从句的定义和功能 表语是用来说明主语的身份、性质、品性、特征和状态的，表语常由名词、形容词、副词、介词短语、不定式、动词的-ing、从句来充当，它常位于系动词（be, become, appear, seem,look,sound,feel,get,smell等词）之后。如果句子的表语也是由一个句子充当的，那么这个充当表语的句子就叫做表语从句。 EG：（并指出其中哪段充当了表语从句） The problem is when we can get a pay rise. His suggestion is that we should stay calm. Our plan is to finish the work in two weeks. She seems as if she had done a great thing That‘s why I want you to work there. The reason why he was late is that his bike broke down. It is because you eat too much. （8）That is because he had to help his little sister with her homework. 二、系动词 表语从句常常由以下系动词引导 1.感官sound feel smell taste look 2.保持不变remain keep stay 3.表变化go come become turn fall appear 4.是am is are 5.表结果prove turn out TIPS：表语从句必须为陈述语序。 三、八大成分可做表语 ①名词作表语 That remains a puzzle to me. ②代词作表语 Who's your best friend ③形容词作表语 I feel much better today. ④数词作表语 She was the first to learn about it. ⑤不定式作表语 Our next step was to get raw materials ready. ⑥介词短语作表语 The patient is out of danger. ⑦副词作表语 The sun is up. ⑧从句做表语 This is what he said. TIPS： 表语从句只能置于主句之后，而主句的动词只能是连系动词。 不像宾语从句，在有表语从句的复合句中，主句时态和从句时态可以不一致. EG:Right: The question is who will travel with me to Beijing tomorrow. Right: The question is why he cried yesterday. 总结：根据语境选择时态。 if不能引导表语从句，只能用whether 来引导。 区分that’s why 和that’s because “That is because...”指原因或理由 “That is why...”则指由于各种原因所造成的后果， 例如：1.He did not see the film last night. That is because he had to help his little sister with her homework（第一句话说明结果， 第二句话说明原因） He had seen the film before. That is why he did not see it last night.他以前曾看过那部电影， 因此他昨天晚上没有去看。（第一句话说明原因， 第二句话说明结果） 习题练习 The reason why he failed is he was too careless. What | want to know is____ he likes the gift given by us. The reason is I missed the bus. What | want to know is he likes the gift given by us. She looked she were ten years younger. --I think it is_____you are doing too much.
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