【第1句】： 用it作形式主語寫一個句子,代替句子

是的 it 作形式主語，主要分為下列三種情況：不定式作主語、動名詞作主語 和 名詞從句作主語。

具體分析如下 不定式作真正主語 主要用于下列句型： ⒈It + is/was + adj./n. （形容詞或名詞） +to do sth. A. 名詞作表語。主要有a pity,a pleasure,an idea等。

例如： In fact________is a hard job for the police to keep order in an important football match. (2001上海高考題) A. this B. that C. there D. it （答案為D） 動名詞作真正主語 用于這種形式的是一些特定的形容詞和名詞。例如： It was nice meeting you. 見到你真高興！ （分別時用） 它與不定式作真正主語的區(qū)別在于，動名詞說到的動作已經(jīng)發(fā)生。

例如： It is nice to meet you. （剛剛見面時用） it 作形式主語，動名詞作真正主語主要用于下列句型： It's +n.（名詞或名詞短語）/adj.（形容詞）+ doing sth. 1）下列形容詞后常用動名詞作真正主語：nice,good,useless,hard,foolish,enjoyable,worthwhile等。例如： It is nice talking to you. 跟你交談?wù)媸怯淇臁?/p>

It's foolish behaving like that. 這樣的表現(xiàn)是很愚蠢的。 It is useless doing that. 那樣做沒用。

名詞從句作真正主語 用it 作形式主語的結(jié)構(gòu)主要用于下列句型： It +謂語+名詞從句（主語從句、表語從句、同位語從句） ⒈It is +名詞+從句： 這樣的名詞有a fact,a surprise,an honor（非常榮幸），a pity,common knowledge（常識）等。例如： It is common knowledge that the full moon brings fair weather. 皓月兆天晴，這是常識。

【第2句】： 造一個含有it用法的英語句子,并且簡單說明是哪種用法

一、作人稱代詞，可用來代替人、物或事。

—Who is knocking at the door？—It's me

The ant is not gathering this food for itself alone. Ithas two stomachs in its body.螞蟻不 只是為自己采食。 它的身體里有兩個胃。

When service is interrupted, as it was by last night'sstorm, John has to inform the pu blic what the company isdoing about the problem.每當(dāng)供電中斷時，就像昨夜因暴風(fēng)雨而造成的那樣 ，約翰就必須通知大家，公司為解決這個問題正在做些什么。

二、作非人稱代詞，表示時間、天氣、季節(jié)、距離、環(huán)境等。

It is tea time. Mrs Tuner goes into the kitchen.It was winter. it was ten degree below zero.

It is only half an hour walk to the tall tower.

It will be lovely in the park today.

三、作先行詞。

【第1句】：作形式主語。英語中不定式、動名詞、主語從句在作主語時主語往往顯得很長，使整個句子看上去有點 頭重腳輕，這樣就借助“it”來作形式上的主語，而把真正的主語移到句子后邊去，使全句看上去平穩(wěn)一些。 “it”沒有實際的意義。

It is fun for her to study, but it is difficult to studyand work at the same time.對于她來 說學(xué)習(xí)是有趣的，可是要邊工作邊學(xué)習(xí)對她來說是困難的。

It is necessary for them to get an electrician to do thework for them.對他們來說請一位電工 來為他們做這項工作是必要的。

It will be no good learning without practice.

It is no use talking to him about it.

It is possible that they're finished the bridge.。

It is important that we should learn from each other andhelp each other.

【第2句】：作形式賓語。這種情況通常只用于能帶以名詞或形容詞作賓語補語的動詞后面。

In the 1870's, when Marx was already in his fifties, hefound it important to study the si tuation in Russia, so hebegan to learn Russian.在19世紀(jì)70年代，馬克思已經(jīng)五十幾歲了，他覺得研 究俄國的形勢很重要，便開始學(xué)習(xí)俄語。

This has made it necessary for agriculture and industryto develop very quickly.這就使得工 農(nóng)業(yè)必須飛速發(fā)展。

四、構(gòu)成強調(diào)句型。為了強調(diào)句子的某一成分，把引導(dǎo)詞“it”用在句首，這種強調(diào)句的結(jié)構(gòu)是“It is (was )+所強調(diào)的成分（主語、賓語、狀語）+that…”，表達(dá)的意思為“是…，正是…，就是…”。“it ”在這種句型中本身沒什么實際意義。

My temperature! It's my back that hurts.

It is not only blind men who make such stupid mistakes. 這里需要說明的是：如被強調(diào)的是人，則后面用who或that， 如被強調(diào)的是物或其他情況，則用that。

It was yesterday that I met Bob in your room.

It was in your room that I met Bob yesterday.

It was Bob that I met in your room yesterday.

【第3句】： 英語,單單一個句子,是it's the best還是it's best

如果是單單一個句子，準(zhǔn)確表達(dá)是：

It's the best. = It is the best.

它是最好的。

如果句子有補充，可以是：

It's best to + 原型動詞。

例如：

It's best to go home now.

It's best to tell her the truth.

It's best to finish the job before it gets dark.

【第4句】： 關(guān)于It的六種基本句型和例句

【第1句】： 陳述句的強調(diào)句，強調(diào)陳述句中的某個成分. 為了強調(diào)句子中的有些成分，要用強調(diào)結(jié)構(gòu)It is(was)+被強調(diào)部分+that(who)+其他部分.被強調(diào)的成分可以是主語、賓語、狀語，但不能是定語表語和謂語.這種類型的強調(diào)句主要注意一下幾個方面： 1)It在這一結(jié)構(gòu)中作主句的主語，所以即使被強調(diào)部分是復(fù)數(shù)名詞，也要用is或was. e.g. Tom and Mark often come to see me. It is Tom and Mark Who often come to see me. （強調(diào)主語） 2）如果被強調(diào)部分是時間、地點、方式或原因也不用when, where, how, why， 而用that；強調(diào)人時可用who，也可用that. e.g.(1)They set out the day before yesterday. It was the day before yesterday that they set out （強調(diào)時間狀語） （2）We put off the sports meet because of the rain. It was because of the rain that we put off the sports meet（強調(diào)原因狀語） （3）It was because she was ill that they didn't ask her to do the job. （強調(diào)原因狀語從句） 3）被強調(diào)部分如果是原句的主語，who或that后面謂語的人稱和數(shù)應(yīng)和原句的主語一致. — Personally, I think it is the salesmanager, rather than the salesgirls, ____ to blame. —I agree with you. A. is B. that is C. are D. who are 【第2句】： 一般疑問句的強調(diào)句，只需把is(was)提前. e.g. (1) Was it in 1939 that the Second World War broke out? (2) Is it Professor Wang who teaches you English? (3) —Was it two months ago _____ you luckily got an opportunity to spend your holiday in Canada？ — _____. John was the lucky dog…… A. when; Not I B. when; Not only C. that; Not all D. that; Not me 【第3句】：特殊疑問句的強調(diào)句，強調(diào)特殊疑問句中的疑問詞. e.g. (1) Where did you find the wallet? Where was it that you found the wallet (2) When shall we meet? When is it that we shall meet？ 從上面的例子中我們可以看出，特殊疑問句的強調(diào)句是由“特殊疑問詞+was(is) it that +陳述句”構(gòu)成的.但是當(dāng)含有特殊疑問詞的強調(diào)句型用在賓語從句中的時候，上述句型應(yīng)改為‘特殊疑問詞+it was( is) that +陳述句“，即采用陳述句語序. e.g. (1) — where was it ____ the road accident happened yesterday？ — In front of the market. A. when B. that C. which D. how (2) I really don't know _____ you returned the book to me. A. when it was that B. when was it C. when was it that D. when it was 【第4句】： 有時可用It might be ……that ……，和It must have been……that……的句型表示強調(diào). e.g. (1)It might be his father that you are looking for. (2)It must have been his brother that you met. 【第5句】： 強調(diào)not……until結(jié)構(gòu)中由until引導(dǎo)的短語（或從句）表示時間狀語的句型是：It is(was) not until……+that……+其他部分. e.g. 1)He didn't marry until forty. It was not until forty that he married. (2)Mr. Yang did not leave the lab until he got everything ready for the experiment. It was not until he had got everything ready for the experiment that Mr. Yang left the lab. (3)_____ he realized it was too late to return home. A. Not until dark B. It was until dark that C. It was not until dark that D. It was dark that注意：如果not……until放在句首時就要用部分倒裝句式，它的語序和在not……until結(jié)構(gòu)中由until引導(dǎo)的短語（或從句）表示時間狀語的句型中的語序不同. 【第6句】： 強調(diào)詞it與先行詞it的區(qū)別. 強調(diào)詞it與先行詞it的區(qū)別可以通過恢復(fù)原句的方式來判斷，即如果把it is……that……去掉后剩下的成分仍然能組成一個完整的句子，這就是強調(diào)句型，否則就不是. It is there that accidents often happen. → Accidents often happen there. 以上就是強調(diào)句型，被強調(diào)成分是狀語，把it is……that……去掉，還原成后來的非強調(diào)句. It is clear that not all boys like football. 上面的句子如果去掉it is……that……后就成了Clear not all the boys like football.很顯然這不是一個完整的句子，因此不是強調(diào)句型，而是由it作先行詞引導(dǎo)的一個主語從句. 【第7句】： 其他的一些強調(diào)句型： It is/was+時間段+since從句，It +時間段+before從句，It is/was+時間點+when從句. 1)It is/was + 時間 + since …，從……已多久了.在這個句型中，主句通常用一般現(xiàn)在時，since從句用過去時，表示一個時間點. e.g.(1)It is five months since I arrived in New York. 我到紐約已五個月了. （2）It is five months since I was in New York.我離開紐約已經(jīng)五個月了. 注意：例句中five months是作為一個整體看待的，所以用it is.在這類句子中，終止性動詞表示從動作發(fā)生時算起；如果是狀態(tài)動詞或持續(xù)性動詞，則從動作或狀態(tài)結(jié)束時算起. 2)It is + 時間+ before ….在這個句型和上面一個句型中，時間都是時間段，如years,five days,twenty minutes等.不過主句的時態(tài)多用一般將來時或一般過去時，從句的時態(tài)要根據(jù)主句的時態(tài)進(jìn)行變化.Before前的主句如果是肯定的，翻譯成“在……之后才……” 主句如果是否定的，翻譯成“不久就……” e.g.(1)It was long before he gave an answer. 過了好久他才答復(fù)我. （2）It was not long before he worked out the difficult maths problem. 不一會兒他就把那道數(shù)學(xué)題解出來了. （3）It will be 。

【第5句】： 關(guān)于it作形式賓語的句子

make sth to the public，表示“告知公眾、讓公眾知道”

to the public這里可以先忽略，

They haven't made it where they are to hold the conference.

they主語，haven't made謂語，it形式賓語，where引導(dǎo)的句子是真正的賓語。

如果把形式賓語去掉：

They haven't made [where they are to hold the conference] to the public.

"他們還沒有告知公眾，將要在哪里召開大會。"

【公益慈善翻譯團(tuán)】真誠為您解答！

【第6句】： 將下列句子換一種表達(dá)法

【第1句】：I' a long river. The river is very long.

【第2句】：I's a big lake. The lake is very big.

【第3句】：It's a famous school. The shool is very famous.

【第4句】：They are beautiful photos. The photos are very beautiful.

【第5句】：It's my lovely hometown My hometown is very lovely.

【第7句】： 【下面的句子可以用另一種方式表達(dá),1

1 what do you want to do in the summer holidays?2 how about going/why not go abroad for a holiday?3 what about going to beijing by plane?4 excuse me,can you tell me the way to the Tong hotel?5 It is exciting to go skiing in australia.加油。

【第8句】： 關(guān)于It的六種基本句型和例句

【第1句】： 陳述句的強調(diào)句，強調(diào)陳述句中的某個成分。

為了強調(diào)句子中的有些成分，要用強調(diào)結(jié)構(gòu)It is(was)+被強調(diào)部分+that(who)+其他部分。被強調(diào)的成分可以是主語、賓語、狀語，但不能是定語表語和謂語。

這種類型的強調(diào)句主要注意一下幾個方面： 1)It在這一結(jié)構(gòu)中作主句的主語，所以即使被強調(diào)部分是復(fù)數(shù)名詞，也要用is或was. e.g. Tom and Mark often come to see me. It is Tom and Mark Who often come to see me. （強調(diào)主語） 2）如果被強調(diào)部分是時間、地點、方式或原因也不用when, where, how, why， 而用that；強調(diào)人時可用who，也可用that. e.g.(1)They set out the day before yesterday. It was the day before yesterday that they set out （強調(diào)時間狀語） （2）We put off the sports meet because of the rain. It was because of the rain that we put off the sports meet（強調(diào)原因狀語） （3）It was because she was ill that they didn't ask her to do the job. （強調(diào)原因狀語從句） 3）被強調(diào)部分如果是原句的主語，who或that后面謂語的人稱和數(shù)應(yīng)和原句的主語一致。 — Personally, I think it is the salesmanager, rather than the salesgirls, ____ to blame. —I agree with you. A. is B. that is C. are D. who are 【第2句】： 一般疑問句的強調(diào)句，只需把is(was)提前。

e.g. (1) Was it in 1939 that the Second World War broke out? (2) Is it Professor Wang who teaches you English? (3) —Was it two months ago _____ you luckily got an opportunity to spend your holiday in Canada？ — _____. John was the lucky dog…… A. when; Not I B. when; Not only C. that; Not all D. that; Not me 【第3句】：特殊疑問句的強調(diào)句，強調(diào)特殊疑問句中的疑問詞。 e.g. (1) Where did you find the wallet? Where was it that you found the wallet (2) When shall we meet? When is it that we shall meet？ 從上面的例子中我們可以看出，特殊疑問句的強調(diào)句是由“特殊疑問詞+was(is) it that +陳述句”構(gòu)成的。

但是當(dāng)含有特殊疑問詞的強調(diào)句型用在賓語從句中的時候，上述句型應(yīng)改為‘特殊疑問詞+it was( is) that +陳述句“，即采用陳述句語序。 e.g. (1) — where was it ____ the road accident happened yesterday？ — In front of the market. A. when B. that C. which D. how (2) I really don't know _____ you returned the book to me. A. when it was that B. when was it C. when was it that D. when it was 【第4句】： 有時可用It might be ……that ……，和It must have been……that……的句型表示強調(diào)。

e.g. (1)It might be his father that you are looking for. (2)It must have been his brother that you met. 【第5句】： 強調(diào)not……until結(jié)構(gòu)中由until引導(dǎo)的短語（或從句）表示時間狀語的句型是：It is(was) not until……+that……+其他部分。 e.g. 1)He didn't marry until forty. It was not until forty that he married. (2)Mr. Yang did not leave the lab until he got everything ready for the experiment. It was not until he had got everything ready for the experiment that Mr. Yang left the lab. (3)_____ he realized it was too late to return home. A. Not until dark B. It was until dark that C. It was not until dark that D. It was dark that注意：如果not……until放在句首時就要用部分倒裝句式，它的語序和在not……until結(jié)構(gòu)中由until引導(dǎo)的短語（或從句）表示時間狀語的句型中的語序不同。

【第6句】： 強調(diào)詞it與先行詞it的區(qū)別。 強調(diào)詞it與先行詞it的區(qū)別可以通過恢復(fù)原句的方式來判斷，即如果把it is……that……去掉后剩下的成分仍然能組成一個完整的句子，這就是強調(diào)句型，否則就不是。

It is there that accidents often happen. → Accidents often happen there. 以上就是強調(diào)句型，被強調(diào)成分是狀語，把it is……that……去掉，還原成后來的非強調(diào)句。 It is clear that not all boys like football. 上面的句子如果去掉it is……that……后就成了Clear not all the boys like football.很顯然這不是一個完整的句子，因此不是強調(diào)句型，而是由it作先行詞引導(dǎo)的一個主語從句。

【第7句】： 其他的一些強調(diào)句型： It is/was+時間段+since從句，It +時間段+before從句，It is/was+時間點+when從句。 1)It is/was + 時間 + since …，從……已多久了。

在這個句型中，主句通常用一般現(xiàn)在時，since從句用過去時，表示一個時間點。 e.g.(1)It is five months since I arrived in New York. 我到紐約已五個月了。

（2）It is five months since I was in New York.我離開紐約已經(jīng)五個月了。 注意：例句中five months是作為一個整體看待的，所以用it is.在這類句子中，終止性動詞表示從動作發(fā)生時算起；如果是狀態(tài)動詞或持續(xù)性動詞，則從動作或狀態(tài)結(jié)束時算起。

2)It is + 時間+ before …。在這個句型和上面一個句型中，時間都是時間段，如years,five days,twenty minutes等。

不過主句的時態(tài)多用一般將來時或一般過去時，從句的時態(tài)要根據(jù)主句的時態(tài)進(jìn)行變化。Before前的主句如果是肯定的，翻譯成“在……之后才……” 主句如果是否定的，翻譯成“不久就……” e.g.(1)It was long before he gave an answer. 過了好久他才答復(fù)我。

（2）It was not long before he worked out the difficult 。