常见的系动词分为三种：A ．表示特征和状态： be, look, sound, taste, smell, seem, appear 等 B ．表示由一类状态转为另一类状态： get, become, grow, turn, fall, go, come, run 等C ．表示保持某种状态的： remain, keep, continue, stay 等 表语从句就是从句在主句中作表语的名词性从句，放在系动词之后。2. 表语从句 结构：“主语 + 系动词 + 表语从句”。连接词 : that / whether /as if /as though ( if 不 引导表语从句 )连接代词 : who / whom / whose / which / what 连接副词 : when / where / why / how / because The question is whether we can rely on him. He looked as if he was going to cry. I was late for school this morning. That’s because I stayed up too late last night.( 果－因 ) I stayed up too late last night.That’s why I was late for school this morning.( 因－果 )注 意：1. 表示原因的名词（ reason,cause ）作句子主语时，连接词要用 that ，而不能用 because 或 why, 即： The reason (why…/for…)is /was that…2. 在表语从句中 , 表“是否”时 , 只能用“ whether”, 不能用“ if” 。3.That is /was because …( 果－因 ) That is /was why… .( 因－果 )4. 主语是表示“建议，命令，要求，计划 (suggestion, advice, proposal,order, command,request,plan)” 等名词时，表语从句应该用虚拟语气，即从句谓语动词用“ should+ 动词原形”， should 可省略。 My suggestion is that we (should) set off early tomorrow.注 意：5. 一般情况下，“ that” 不能省。 The truth is that he has never been to the countryside.6. It looks as if it were going to rain. as if /as though 从句常表示不真实的情况 .7. This school is no longer what it was before.( 引导表语从句，并在从句中作表语 ) 这所学校不再是从前的那个样子了。 (what =the thing that) He is not what he used to be.( 引导表语从句，并在从句中作表语 ) 他不再是过去的那个他了。 (what =the person that )注意下列表语从句中 where, how, why 的译法1. ...
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