as if的用法總結
as if 連接的從句,即可表示對現在、將來時間的虛擬,又可以是對過去時間的虛擬。 擴展資料
1、基本用法
as if 從句用虛擬語氣，當說話人認為句子所述的是不真實的或極少有可能發生或存在的情況時。從句虛擬語氣動詞時態的形式如下：
1、如果從句表示與現在事實相反，謂語動詞用一般過去時。
2、從句表示與過去事實相反，謂語動詞用“had＋過去分詞”。
3、從句表示與將來事實相反，謂語動詞用“would／could／might＋動詞原形”。例如：
You look as if you didn’t care．你看上去好像并不在乎。
He talks about Rome as if he had been there before．他說起羅馬來好像他以前去過羅馬似的。
He opened his mouth as if he would say something．他張開嘴好像要說什么。
2、兩點說明
1.從句所表示的內容若為事實或可能為事實，也可用陳述語氣。
It looks as if we'll be late.我們似乎要遲到了。
This meat tastes as if it has already gone bad.這肉吃起來似乎已經壞了。
在現代英語中，有時即使從句內容不是事實，也可用陳述語氣。
I feel as if I'm floating on air.他感到好像漂浮在空中。
The stuffed dog barked as if it is a real one.玩具狗叫起來像真狗。
2.注意It isn't as if的翻譯
It isn't as if…是英語中的.固定句式，也可說成 It’s not as though，主要用于表示某個解釋不正確，意思是“好像不是”“顯然不是”“真不是”等。
It isn't as if he were poor. 他不像窮的樣子（他又不窮）。
It isn’t as if he didn’t recognize me! He just walked straight past me as I stood there. 他不像是沒認出我！可是我站在那里他逕直從我跟前走過。
3、as if 從句的作用
1.在look，em等系動詞后引導表語從句。
She looks as if she were ten years younger.
她看起來好像年輕了十歲。
2.引導方式狀語從句
She loves the boy as if he were he father.
她愛這個男孩，就好像他是她的父親一樣。
4、as if還可用于省略句
如果as if引導的從句是“主語+系動詞”結構，可省略主語和系動詞，這樣as if后就只剩下名詞、不定式、形容詞（短語）、介詞短語或分詞。
He acts as if (he were)a fool.
他做事像個傻子。
She left the room hurriedly as if (she were)angry.
她匆忙離開房間好像生氣的樣子。
as if的用法歸納總結
1、as if后接表語從句。
當as if后接表語從句中，其通常用于“It loos/ems as if…”的句型中，表示“看起來似乎……”。
2、as if后接狀語從句。
當as if后接狀語從句，其含義為“似乎，就好像……”。當所描述的內容，是真實的或極有可能發生或存在的事實，從句通常用陳述語氣，句子的謂語用look，em，taste，smell，feel等。
3、as if后從句也可以用虛擬語氣。
as if的謂語動詞有時也要使用虛擬語氣，用來表示句子中所描述的情況與事實相反，或極少情況發生的情況。
as if 的用法
as if/as though
Holding his head high, he walked past the pole and the soldiers as if they didn’t exist.
as if 與as though 是一組同義詞，兩者意思相同，用法也相同，只是在口語中人們多半會用as if, 取其簡短。as if
和as though 用法較為復雜，本文擬對其各種用法做一概述。
1．在通常情況下， as if 和as though 所引導的從句的謂語動詞多用虛擬語氣，表示所敘述的情況與事實相反。具體用法如下：
1)談論現在情形的，用過去時（動詞be用were,也可用was）：
Why is she looking at me as though she knew me? 他為什么那樣看我？像是認識我似的。
He behaves as if he owned the hou. 他的樣子好像他擁有這個房子。
He treats me as if /as though I were a stranger.
He speaks as if he were an Englishman.
It’s not as though he was /were poor.
2)談論過去情形的動詞形式有以下幾種：
a)過去式，表示過去的狀態，如：
He looked at me as if I were mad. 他那樣看我，好像我是個瘋子。
He stood there looking at the train and laughing, as if to miss a
train was the best joke in the world.
他站在那里，望著火車哈哈大笑，好像誤了火車是天底下最開心的事兒似的。
Mr. Coleman always talked as if he knew everything.
但是，如果狀態動詞帶有持續時間狀語，則用過去完成時：
They talked as if they had been friends for years. (高二冊，第95頁)
(試比較：They had been friends for years.)
Now it is as though she had known Millie for years. (《現代英語用法詞典》)
情態動詞亦用過去時：
She felt as though she could hardly endure such a life.
她覺得簡直無法忍受這樣的生活。
b)過去完成時，表示過去的動作先于主句動詞而發生或完成，如：
It was as if he had lost his last friend.
“I remember,” she tells her children now, “how wild his white hair
looked——as if it had been electrified.”（高二冊，第91頁）
必須注意的時，在指過去的動作時，即使主句是現在時，as if 從句中的動詞也要用過去完成時：
You look as if you’d en a ghost. 你好像是見了鬼似的。
He talks about Rome as though he had been there himlf.
他講起羅馬的情況來就好像他親自到過那里似的。
c)過去進行時，表示動作正在進行：
He heard a noi, as if someone was breathing.（高一冊，第211頁）
He ran as if ghosts were chasing him.
I felt as if the ground were slipping beneath my feet. 我感到大地仿佛在腳下滑動。
d)過去將來時，表示將要發生的事態：
It looked as if it was going to snow. （高一冊，第127頁）
He opened his lips as if he would say something to you.
2. 如果as if后面的從句所表示的情況時真實的或很可能時真實的，則動詞可以用陳述語氣，在feel, look, em
smell, sound, taste之后尤其如此。試比較：F. T. Wood所著English Colloquial
Idioms中的兩個例子：
He walks as if he is drunk.
He walks as if he were drunk.
第一句表示“他已經醉了”，第2句則表示“他沒有醉”。又如：
It looks as if it is going to rain.
It looks as if were going to rain.
第一例意味著快要下雨了，第二例則意味著不會下雨。再看其她例子：
There’s Hob, talking to the ticket-collector. It looks as if he
hasn’t got a platform ticket. 那不，霍布正在同檢票員說話，看樣子還沒弄到站臺票。
You look as if you’ve been running. 你好像剛跑了一陣似的。
You look as if you know each other.
He looks as if he’s tired.
It looks/ems as if you’re right.
You have acted as if you like me.
It smells as if it is fresh. 聞起來很新鮮。
3. 隨著語言的發展，as if
后面的從句即使反映的不是事實，也可以不用虛擬語氣而用陳述語氣，這主要出現在口語或不太正式的文體中。例如：
With the development of the new tools, it is as if man has
suddenly become a millionaire of the mind.
隨著這些新工具的發展，人好像突然間成為精神上的百萬富翁似的。
Teen-agers may talk as if they know it all, but statistics tell a
different story.
The “historical prent” is sometimes ud in narrative when we want
to describe events vividly as if they are happening in our prence.
4. 在非正式文體（尤其是美國英語）中，可以用like做連詞代替as if 和as though。例如：
It looks like it’s going to rain today.
She looks like she’ll win the race.
I love that boy like he was my son.
He looked like he needed someone to talk to, so we lent him an ear.
He sat there smiling like it was his birthday.
She started kissing me like we were on our honeymoon.
她開始吻我，好像是在度蜜月似的。
5. as if和as though從句中的省略
當as if和as though從句的主語與主句一致時，該主語和后面的動詞可以省略。于是便出現下面幾種結構：
1) as if +不定式
He opened his lips as if (he were) to make some reply.
The bee checked its forward speed, circled and then drifted slowly
over the mirrorlike surface of the pool as if to admire its own
reflection. 蜜蜂放慢飛行速度，轉了幾圈兒，然后在清澈如鏡的水潭上空慢慢地飄過，似乎要欣賞它自己的倒影。
2) 不定式+形容詞或形容詞短語
Carrie felt as if unable to endure such a life. 嘉莉覺得似乎無法再忍受這種生活了。
He lay still for a long while, as if dead.
3) as if +介詞短語
He looked about as if (he was) in arch of something.
4) as if +現在分詞
From time to time Jason turned round as though (he was) arching
for someone.
John paud as if expecting Mary to speak. 約翰停下來，似乎是等瑪麗開口。
Nevertheless, the bee kept exercising the wings slowly up and down,
as though asssing the damage.
然而，那只蜜蜂仍然在不停地慢慢上下活動著它地翅膀，仿佛在估量著所受的損害。
5) as if +名詞
He acts as if (he was) a fool.
6) as if +副詞
He made that remark as if abntly. 他好像是漫不經心地說了那句話。
6. 對as if-從句認識上的一個誤區
對于as if 的用法，一些人的認識上存在著一個誤區，即把as
if從句中動詞的形式與主句的時態相聯系。如1993年第10期《英語自學》中《淺談由as if (as
though)和wish引出的虛擬語氣就明確指出：“在由as if (as
though)引出的表示虛擬語氣的方式狀語從句中，如果主句的謂語是一般時，那么其從句的謂語一般應該用動詞的過去式
(be用were)；反之，如果主句的謂語用一般過去時，那么從句謂語一般用“had
+過去分詞”。這種認為從句動詞形式受主句時態制約的觀點是不符合語言實際的。實際上，as if和 as
though后謂語動詞的形式與主句時態無關。本文前面列舉的一些例句足以證明這一點，《現代英語慣用法詞典》上也有如下例句：
He looks as if he were ill.
He looked as if he were ill.
He looks as if he had been ill.
He looked as if he had been ill.
我們在前面也有過類似的例句。下面在提供一些主句用現在時而從句仍用過去完成時的例句：
A: We’ve been back at work now for three days. 我們回來上課到現在已三天了
B: I feel as if I had been back for three months. 我感到似乎已回來三個月了。
（比較：I have been back for three months.）
6. as if和as though的功能
1) 引導方式狀語從句
They talked as if they had been friends for years.
2) 引導表語從句
He looked as if he had just stepped out of my book of fairy
tales and had pasd me like a spirit. (高二冊，第92頁)
3) 引導感嘆句，表示對某種建議、假定、想象等的反對：
As if I cared! 好像我很在乎似的！（相當于：I don’t care!）
As if anyone would believe that story! 好像人人都會相信那種說法似的！
He warned me against associating with people of doubtful character.
As if I ever should! 他告誡我不要同可疑的人來往，好像我真會那樣做似的！
as if用于什么時態？
as if,as though的用法：
這兩個復合從屬連詞的用法和意義完全一樣,但as if 在當代英語中比 as though 普通得多.
as if 引出的方式狀語從句所表示的情況是事實或具有很大可能性時,通常用直陳語氣.名子的謂語我為look,em,taste,smell,sound等.如：
It looks as if they have succeeded in the experiment.看來好像他們試驗成功了.
as if 引出的方式狀語從句所表示的情況不是事實,而是主觀想象或夸大性的比喻時,通常用虛擬語氣.從句中謂語動詞一般用過去時,be 動詞常用 were,但在現代英語中也常見到單數 was的情況.如：
The young man with long hair looks as if he were a girl.這位滿頭長發的男青年看上去像個女的.
The injured man acted as if nothing had happened to him.這位受傷的男子表現得好像沒發生什么事一樣.
as if 引出的方式狀語從句,當主句謂語是過去時態時,從句謂語形式常常沒有什么特殊之處.如：
The lady felt as if she lost something.這位女士好像學得丟了什么東西.
He was singing as though / if he hadn't had / didn't have a care in the world.他唱著歌,好像人世間他沒有憂慮.
as if 引導的同一從句中所用的時態不同,意思往往不同.請比較：
The clown looks as if he were ill.那個小丑好像害病似的.（虛擬語氣）
The clown looked as if he had been ill.那個小丑過去好像生過病.（過去生過病或虛擬語氣）
希望對你有幫助
asif的用法？？？？？？
as if 的用法 as if 好像，好似 She spoke to me as if she knew me. 她和我說話的神情，好像她早就認識我似的。 (= as though)as if 的用法 一、as if 從句的作用 1． 在look, em 等系動詞后引導表語從句。如： She looks as if she were ten years younger． 她看起來好像年輕了十歲。 It ems as if our team is going to win． 看來我們隊要勝了。 2． 引導方式狀語從句。如： She loves the boy as if she were his mother． 她愛這男孩，就好像她是他的母親一樣。 The child talked to us as if he were a grown?up． 那孩子跟我們談起話來，像個成年人似的。 二、as if 還可用于省略句中 如果as if 引導的從句是“主語＋系動詞”結構，可省略主語和系動詞，這樣as if 后就只剩下名詞、不定式、形容詞（短語）、介詞短語或分詞。如： He acts as if （he was） a fool． 他做事像個傻子。 Tom raid his hands as if （he was going） to say something． 湯姆舉起手好像要說什么。 She left the room hurriedly as if （she was）angry． 她匆忙離開房間好像生氣的樣子。 三、as if 從句的語氣及時態 1． as if 從句用陳述語氣的情況。 當說話者認為句子所述的是真實的或極有可能發生或存在的事實時。如： It sounds as if it is raining． 聽起來像是在下雨。 He talks as if he is drunk． 從他談話的樣子來看他是醉了。 2． as if 從句用虛擬語氣的情況。 當說話人認為句子所述的是不真實的或極少有可能發生或存在的情況時。從句虛擬語氣動詞時態的形式如下： （1）如果從句表示與現在事實相反，謂語動詞用一般過去時。如： You look as if you didn’ t care． 你看上去好像并不在乎。 He talks as if he knew where she was． 他說話的樣子，好像他知道她在哪里似的。 （2）從句表示與過去事實相反，謂語動詞用“had＋過去分詞”。如： He talks about Rome as if he had been there before． 他說起羅馬來好像他以前去過羅馬似的。 The girl listened as if she had been turned to stone． 那女孩傾聽著，一動也不動，像已經變成了石頭似的。 （3）從句表示與將來事實相反，謂語動詞用“would／could／might＋動詞原形”。如： He opened his mouth as if he would say something． 他張開嘴好像要說什么。 It looks as if it might snow． 看來好像要下雪了。
asif引導什么狀語從句？
1、在look，em，smell，taste，sound等連系動詞后面as if引導表語從句。
如：She looks as if she were ten years younger.她看起來好像年輕了十歲。
2、如果主句的謂語動詞不是聯系動詞be等，as if引導的則是方式狀語從句。
如：The child talked to us as if he were a grow-up.那孩子跟我們談起話來，像個成年人似的。
如果as if引導的從句是“主語＋系動詞”結構，可省略主語和系動詞，這樣as if后就只剩下名詞、不定式、形容詞（短語）、介詞短語或分詞。例如：He acts as if he werea fool.他做事像個傻子。
擴展資料
as if的用法
1、as if從句用陳述語氣的情況。當說話者認為句子所述的是真實的或極有可能發生或存在的事實時。
如：It sounds as if it is raining.聽起來像是在下雨。He talks as if he is drunk.從他談話的樣子來看他是醉了。
2、as if從句用虛擬語氣的情況。當說話人認為句子所述的是不真實的或極少有可能發生或存在的情況時。
