【正文】 It is good news that … ……是好消息It is a question that … ……是個問題It is mon knowledge that … ……是常識類似的名詞還有：a pity；a wonder；a good thing； no wonder； surprise等。（2） It is +形容詞+從句It is necessary that … 有必要……It is clear that … 很清楚……It is likely that … 很可能……It is important that … 重要的是……類似的形容詞還有：strange。 natural。 obvious。 true。 good。 wonderful。 possible。 unlikely。 quite。 unusual。 certain。 evident。 worthwhile。 surprising。 interesting。 astonishing, etc.（3） It is +過去分詞+從句It is said that … 據(jù)說……It is reported that … 據(jù)報道……It has been proved that … 已證明……It must be proved that… 必須指出……類似的過去分詞還有：known。 estimated。 expected。 believed。 thought。 hoped。 noted。 discussed。 required。 decided。 suggested。 demanded。 made clear。 found out,etc.。當(dāng)“及物動詞 + 賓語”較短時，也可用這種結(jié)構(gòu)。It shocked me that Peter did not tell anybody where he was.讓我吃驚的是彼得沒有告訴任何人他在哪里。.表語從句一. 在復(fù)合句中作表語的從句, 就叫做表語從句。表語從句一般放在系動詞之后,結(jié)構(gòu)是“主語+系動詞+表語從句”。連系動詞：be動詞、表示持續(xù)的系動詞（keep, remain, stay）、感官動詞feel(摸起來，感覺) , smell(聞起來) , sound(聽起來) , taste(嘗起來，吃起來) 等、表示變化的系動詞（bee, grow, turn, fall, get, go,）、表終止的系動詞prove, turn out(結(jié)果是，證明是)、seem, appear（看起來）連系動詞通常不用于被動語態(tài)和進(jìn)行時態(tài)中。He has bee what he wanted to be ten years ago. 他已經(jīng)成為了他10年前想成為的。His suggestion is that we should stay calm. 他的建議是，我們應(yīng)該保持冷靜。二．表語從句的引導(dǎo)詞：that / whether /as if /as though/as/because(1) that引導(dǎo)表語從句本身沒有詞義，在句中只起連接作用，不充當(dāng)句子成分，一般不能省略。That fact is that more than seventy percent of the earth’s surface is covered by water.連接詞that一般不能省略，但當(dāng)主句中含動詞do的某種形式時，that可以省略。What I want to do is (that) I can go up to him and thank him. 我想做的事是走到身邊去感謝他。(2) whether引導(dǎo)表語從句表示“是否”,但不充當(dāng)句子的成分。The question is whether we can finish our work by tomorrow evening.if 與whether均意為“是否”，但引導(dǎo)表語從句時，只能用whether, 不能用if。(3)as if/though“好像”，引導(dǎo)表語從句時要注意語態(tài).如果句中的情況與事實(shí)不相符，從句多用虛擬語氣。如果從句表示與現(xiàn)在事實(shí)相反,謂語動詞用一般過去式；如果從句表示與過去事實(shí)相反時,謂語動詞要用“had + 過去分詞 ”，如果從句表示將來的可能性不大，用would (might ,could )+動詞原形.Li Lei is now in a new jacket. He looks as if he were an American boy. (現(xiàn)在事實(shí)相反)The girl is giving us a vivid description of the moon. It seems as if she had been to the moon many times. （與過去事實(shí)相反）It looks as if it might rain. （與將來事實(shí)相反）但是，如果as if/though引導(dǎo)的表語從句所表示的與事實(shí)相符，從句則用陳述語氣。The clouds are gathering. It looks as if is going to rain.(4) as引導(dǎo)表語從句He looked just as he had looked ten years before.他看起來還與十年前一樣。(5) because引導(dǎo)表語從句常用結(jié)構(gòu)：This/That/It is/was becauseThat is because I don’t like Chinese.：who/whom/whose/what/which/whoever/whatever/whichever/whomever，在表語從句中做主語、賓語、表語和定語。Tom is no longer what he used to be. (what做表語)The problem is who is fit for this job. (who做主語)This is what I want to tell you. (what做賓語)The problem is whose work is the best. (whose做定語)：when/where/how/why，在表語從句中做狀語。The question is how he did it. 問題是他是如何做此事的。The question is where we can live. 問題是我們能住在哪兒。注意一．reason做主語或主語中包含事件的起因時,后面的表語從句表示原因時要用that來引導(dǎo),而不用because；why引導(dǎo)主語從句做主語時，表語從句用that引導(dǎo)，不用because。The reason is that he got up late.Why he is late is that he got up late.二. that is why/because(1) That is why ...是常用句型,其中why引導(dǎo)的從句在句中作表語,該句型通常用于針對前面已經(jīng)說過的原因進(jìn)行總結(jié)。That is the reason why ...與That is why ...是同義的，“這就是……的原因/因此……”，但是從語法結(jié)構(gòu)上講That is the reason why ...中的why引導(dǎo)的是一個定語從句。That is why she failed to pass the exam. 那就是她考試不及格的原因。(why 在表語從句中充當(dāng)原因狀語) That is the reason why she failed to pass the exam.那就是她考試不及格的原因。(why 在定語從句中充當(dāng)原因狀語) (2) That is because句型中從屬連詞because引導(dǎo)的名詞性從句在此作表語，這也是個常用句型，意為“這就是因?yàn)椤?。That is because I got up late. 這是因?yàn)槲移鸫策t了。(3) “That is because...”與“That is why...”之間的不同在于“That is because...”指原因或理由， “That is why...”則指由于各種原因所造成的后果。I was angry. That was because he didn’t understand 。(表語從句強(qiáng)調(diào)原因)That’s why he got fired from that 。(表語從句強(qiáng)調(diào)結(jié)果)三. The reason (why…/for…)is /was that…. 的原因是The reason for his absence is that he got up late.The reason why he is absent is that he got up late.他缺席的原因是他起床遲了。四. 使用虛擬語氣的表語從句在表示建議、勸告、命令、計劃含義的名詞后的表語從句，謂語動詞需用“should+動詞原形”表示虛擬語氣，should可省略。常見的詞有：advice，suggestion，order，request，proposal，plan，idea等。My suggestion is that we （should） start early tomorrow.