4. Was it in this palace the last emperor died ?
A. that B. in which C. in where D. which
〖答案與簡析〗選A。測試it 用在強調(diào)結(jié)構(gòu)中，為了強調(diào)句子的某一成分（通常是主語、賓語或狀語），常用強調(diào)It is (was) + 被強調(diào)成分 + that(或who）…。被強調(diào)部分指人時用 that 或 who ，在其它情況下（包括強調(diào)時間或地點狀語）用that 。又如：
1）Was it during the Second World War he died ? (MET 88）
A. that B. which C. in which D. then
2) It was not she took off her dark glasses I realized she was a famous film star .
A. when ; that B. Until ; that C. until ; when D. when ; then
答案 1) A 2) B。
3. I don't think possible to master a foreign language without much memory work .
A. this B. that C. its D. it
〖答案與簡析〗選D。測試 it 用作形式賓語，代替由不定式、動名詞或從句表示的真正賓語。當賓語有自己的補足語時，用it作形式賓語，真正賓語放在補足語之后。常用這種句型的動詞有think , make , find , feel , consider 等。
2. Is necessary to tell his father everything ?
A. it B. that C. what D. he
〖答案與簡析〗選A。測試 it 用作形式主語，代替由不定式（或不定式復合結(jié)構(gòu)）、動名詞或從句表示的真正主語。又如：
1）Is possible to fly to the moon in a spaceship ?
A. now B. man C. that D. it
2）Is necessary to complete the design before National Day ?
A. this B. that C. he D. it
3）Does matter if he can't finish the job on time ?
A. this B. that C. he D. it
4）It worried a bit her hair was turning grey .
A. while B. that C. if D. for
答案1） ― 4）DDDB。
1. Tom's mother kept telling him that he should work harder , but didn't help .
A. he B. which C. she D. it
〖答案與簡析〗選D。測試 it 用作人稱代詞，代替前文提到過的事物。又如：
1）― The light in the office is still on.
― Oh , I forgot .
A. turning it off B. turn it off C. to turn it off D. having turned it off
2）― Have you heard the news about Tom ?
― No , what ?
A. is it B. it is C. are they D. they are
3）If you don't know the word , why don't you in the dictionary ?
A. look at it B. look after it C. look up it D. look it up
答案1）― 3）CAD。值得注意的是，由動詞和副詞組成的短語動詞用it 作賓語時，it 應置于動詞和副詞之間。
2. it 代替連接代詞或連接副詞引導的從句作形式主語。
1) It is known (not decided , not made clear , found out , discussed , being discussed , being considered , a question , uncertain等) + 連接代詞或連接副詞引導的從句。
It is still a question when we shall have our sports meet . 我們將什么時候舉行運動會還是一個問題。
It is uncertain whether he can attend this conference or not . 他能否來開會還不能確定。
2) It doesn't matter(doesn't matter too much , doesn't make too much difference等) + 連接代詞或連接副詞引導的從句。如：
It doesn't matter whether we go together or separately . 我們一起去還是分開去都可以。
It doesn't matter too much to me what you do or where you go . 你做什么或去什么地方，對我都無關緊要。
【動腦動手】
單元能力立體檢測
1. it 代替連詞 that 引導的從句作形式主語。
1) it + be + 過去分詞 + that 從句
It's said that Tom has come back from abroad . 據(jù)說湯姆已經(jīng)從國外回來了。
It was reported that dozens of children died in the accident . 據(jù)報導，數(shù)十名兒童在事故中死亡。
可用于該句型的過去分詞還有：known , thought , told , believed , hoped , announced ,expected , decided , suggested等，該句型常可以轉(zhuǎn)換成含有賓語從句的復合句或者含有不定式作主補的簡單句。如：
It's said that Tom has come back from abroad . →People say that Tom has come back from abroad . →He is said to have come back from abroad .
2) It + be + 名詞詞組 + that 從句
It's a pity that he can't swim for his age . 真遺憾，就他的年齡來講，他竟不會游泳。
It's a wonder that you could finish such a hard task in such a short time . 真奇怪，你竟能在如此短的時間內(nèi)完成艱巨的任務。
可用于該句型的名詞詞組還有：an honour , a good thing , a fact , a surprise , good news等。
3) It + be /seem + 形容詞 + that 從句
It is likely that they will beat us tonight .今晚很可能他們會贏我們。
It doesn't seem that she will give us a hand .她幫我們的可能性似乎不太大。
可用于此句型的開容詞還有；wonderful , true , good , right , wrong , (un)important ,useless , surprising , clear , possible , unusual , lucky , certain 等。
4) It + seem / appear / happen + that 從句
It seems that he enjoys pop songs very much .看來他非常喜歡流行歌曲。
It appears that Tom might change his mind .看來湯姆會改變主意。
It happened that I went out that day .碰巧我那天外出了。
注意，句型4可轉(zhuǎn)換成含不定式的簡單句。如上述句子可轉(zhuǎn)換為：
He seems to enjoy pop music very much . / Tom appears to change his mind ./ I happened to go out that day.
6. It / This / That + the first(second , third …) time + that-clause
這個句型表示截止到說話時為止的某人的一種經(jīng)歷，關鍵是注意time前有序數(shù)詞，主句是 is 時 ，從句要用現(xiàn)在完成時；如果主句用一般過去時was ，則從句須相應地用過去完成時。例如：
This is the first time (that) these Europeans have visited the Great Wall .
It was the fifth time (that) I had paid a friendly visit to Africa .
二、It代替從句作形式主語的常見句型
5. It + be + time + that-clause
這個句型屬虛擬語氣結(jié)構(gòu)，不管主句中用的是 is 或 was ，that從句都須用動詞的過去式或should + 動詞原型(但不及用過去式普通)，在time之前有時可加上high或about 以加強語氣。例如：
It is time(that)we handed in our exercises .(= It is time that we should hand in our exercises .)
It is high time (that ) she wrote a letter to her boyfriend .
4. It + be + 時間 + that-clause
這個句型是個強調(diào)句型。例如：
It was two years ago that he made an important invention .
(原句是：He made an important invention two years ago . )
It was at 5 o'clock that he practised playing the violin in the morning .
(原句是：He practised playing the violin at 5 o'clock in the morning . )
比較：It was 5 o'clock when he started in the morning .
(5 o'clock前沒有介詞，這是個定語從句)
3. It + be + 時間 + when-clause
這個句型中, it 指時間，而且表示時間的詞語前沒有介詞(時間一般為具體時間)。主句中的謂語動詞和從句中的謂語動詞在時態(tài)上一般是一致的，主句是will be，when從句用一般現(xiàn)在時代替將來時。例如：
It was already 8 o'clock when we got home .
It was the next morning when we finished our work .
It will be midnight when they get there .
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