、表语从句讲解及专项练习概念：表语从句是在复合句中作表语的名词性从句。
放在系动词之后,一般结构是“主语+系动词+表语从句”可以接表语从句的连系动词有be, look, remain, seem等。
"★ The trouble is that we are short of money.困难是我们资金短缺。
★ That is why stone walls are used instead of fences around New England fields.这就是为什么在新英格兰用石头墙而不用栅栏的原因。
★ At that time, it seemed as if I couldn't think of the right word anyhow.当时,我似乎怎么也想不出一个恰当的字眼来。
引导表语从句的词：'从属连词that、whether、as though、 as if（That引导表语从句时，在口语中，间或可以省略。
）关系代词who, what, which, whom, whose, whatever, whoever, whomever, whichever 等；关系副词when, where, why, how, however, whenever, wherever等。
※ 由从属连词that，whether引导的表语从句。
that在引导表语从句时无词义，而whether有词义，意为、“是否”。
这时主句的主语常常是些抽象名词，如question(问题)，trouble(麻烦)，problem(问题)，result(结果)，chance(可能性)，suggestion(建议)，idea(想法)，reason(理由)等。
表语从句对主句主语进行说明、解释，使主语的内容具体化。
:例如：★ The trouble is (that) she has lost his money. 麻烦的事是他丢了钱。
★ The question is whether we need more ice cream.问题是我们是否还需要一些冰淇淋。
★ The problem was that it was too valuable for everyday use.问题是它作为日常之用太贵重了。
★ What she couldn’t unde rstand was that fewer and fewer students showed interest in her lessons. 我们不能理解越来越少的学生对他的课不感兴趣。
※ 由关系代词引导的表语从句。
关系代词who, what, which, whom, whose, whatever, whoever, whomever, whichever 等引导表语从句，在句中作主语、宾语、表语，关系代词不能省略。
例如：>★ The question is which of us s hould go.问题是我们哪一个应该去。
★ The problem was who could do the work.问题是谁能做这项工作。
★ That's what he is worrying about.那就是他在担心的事。
★ That's what we should do.那是我们应该做的。
※由关系副词引导的表语从句。
关系副词 when, where, how, why 除在句子起连接作用外，在从句中还充当时间，地点，方式或原因状语，本身具有词义。
例如：★Go and get your coat. It's where you left it. 去把雨衣拿来。
就在你原来放的地方。
^★ I had neither a raincoat nor an umbrella. That’s why I got wet through. 我们既没伞也没雨衣，这是我们淋湿的原因。
★ That is how mice ruin many stores of grain every year.那就是老鼠是怎样每年损害大量粮食的。
★ That is wh at he is worried about.那就是他所担心的。
※ 由连词because，as if/as though等引导的表语从句。
★ It looked as if it was going to snow.看起来好像要下雪了。
★ That's because we never thought of it.这是因为我们从未想过此事。
★ It seems as if he didn’t know the answer.好像他不知道答案。
\注意A. 表语从句一定要用陈述语序。
False: The question is when can he arrive at the hotel.Right: The question is when he can arrive at the hotel.B. 不可以用if，而用whether 连接表语从句(as if 例外）。
引导宾语从句时可以互换if/whether 位于介词后要用whether位于句首时要用whether。
引导表语从句，主语从句，同位语从句时要用whether。
…False: The question is if the enemy is marching towards us.Right: The question is whether the enemy is marching towards us.Right: It looked as if he had understood this question.C.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。
Right: The question is who will travel with me to Beijing tomorrow.Right: The question is why he cried yesterday.D. that在表语从句中不可以省掉。
：基本用法表语从句只能置于主句之后，而主句的动词只能是联系动词。
名词性从句在be等系动词后作表语时被称为表语从句例如：★The problem is how we can get the things we need.问题是我们怎样能弄到我们需要的东西。
(how 在表语从句中充当方式状语)★ The scisso rs are not what I need. 这把剪刀不是我所需要的。
(what 在表语从句中充当宾语)'★ What I told him was that I would find him a good play. 我告诉他的是我会给他找个好剧本。
(what在主语从句中作直接宾语， that作为表语从句的引导词在该表语从句中不充当句子成分，不能省略)★ That is what I want to tell you.那就是我想要对你讲的。
(what在表语从句中充当直接宾语)★ That is why she failed to pass the exam. 那就是她考试不及格的原因。
(why 在表语从句中充当原因状语)表语测试1. The question is ________ we will have our sports meet next week.A. thatB. ifC. whenD. whether;2．The reason why he failed is ________he was too careless.A. becauseB. thatC. forD. because of3. Go and get your coat. It’ s ________you left itA. whereB. thereC. there whereD. where there4．The problem is _________to take the place of TedA. who can we getB. what we can getC. who we can getD. that we can get5. What I want to know is ______ he likes the gift given by us.{A. thatB. ifC. whetherD.不填6. The reason is_________ I missed the bus.A. thatB. whenC. whyD. what7. That is __ ___ we were late last time.A. thatB. whenC. whyD. what8. She looked _________ she were ten years younger.A. thatB. likeC. asD. as though9.—I fell sick!~--I think it is _______ you are doing too much.A. whyB. whenC. whatD. because10. The reason why he hasn’t come is ___________.A. because his mother is illB. because of his mother’s being illC. that his mother is illD. for his mother is ill11. —He was born here.-- That is _______ he likes the place so much.A. thatB. whatC. whyD. how/is ______ Lu Xun once lived.A. whatB. whereC. thatD. why13．_______your father wants to know is________ getting on with your studies.A. What; how are youB. That；how you areC. How；that you areD. What；how you are14. The trouble is__________ we are short of tools.A. whatB. thatC. howD. why that15. America was __________was first called “India” by Columbus.￥A. whatB. whereC. the placeD. there where16. China is becoming stronger and stronger. It is no longer_________ .A. what it used to beB. what it was used to being《C. what it used to beingD. what it was used to be17. ________he really means is ________he disagrees with us.A. What … thatB. That … whatC. W hat … whatD. That … what%18. The energy is ________ makes the cells able to do their work.A. thatB. whichC. whatD. such19 —I drove to Zhuhai for the air show last week.$—Is that_____ you had a few days offA. why B .what C. when D. where20 .I had neither a raincoat nor an umbrella ____I got wet through.:A. It’s the reasonB. That’s whyC. There’s whyD. It’s how21. See the flags on top of the building That was ______ we did this morning. "A. whenB. whichC. whereD. what22. --- Are you still thinking about yesterday’s game---Oh, that’s _____."A. what makes me feel excitedB. whatever I feel excited aboutC. how I feel about itD. when I feel excited23. What surprised me was not what he said but ______ he said it.|A. the wayB. in the way thatC. in the wayD. the way which答案1~5: DBACC6~10 :ACDDC 11~15:CBDBA 16~20: AACAB 21~23: DAA。