as if的用法总结
as if 连接的从句,即可表示对现在、将来时间的虚拟,又可以是对过去时间的虚拟。 扩展资料
1、基本用法
as if 从句用虚拟语气，当说话人认为句子所述的是不真实的或极少有可能发生或存在的情况时。从句虚拟语气动词时态的形式如下：
1、如果从句表示与现在事实相反，谓语动词用一般过去时。
2、从句表示与过去事实相反，谓语动词用“had＋过去分词”。
3、从句表示与将来事实相反，谓语动词用“would／could／might＋动词原形”。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．他说起罗马来好像他以前去过罗马似的。
He opened his mouth as if he would say something．他张开嘴好像要说什么。
2、两点说明
1.从句所表示的内容若为事实或可能为事实，也可用陈述语气。
It looks as if we'll be late.我们似乎要迟到了。
This meat tastes as if it has already gone bad.这肉吃起来似乎已经坏了。
在现代英语中，有时即使从句内容不是事实，也可用陈述语气。
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.玩具狗叫起来像真狗。
2.注意It isn't as if的翻译
It isn't as if…是英语中的.固定句式，也可说成 It’s not as though，主要用于表示某个解释不正确，意思是“好像不是”“显然不是”“真不是”等。
It isn't as if he were poor. 他不像穷的样子（他又不穷）。
It isn’t as if he didn’t recognize me! He just walked straight past me as I stood there. 他不像是没认出我！可是我站在那里他迳直从我跟前走过。
3、as if 从句的作用
1.在look，em等系动词后引导表语从句。
She looks as if she were ten years younger.
她看起来好像年轻了十岁。
2.引导方式状语从句
She loves the boy as if he were he father.
她爱这个男孩，就好像他是她的父亲一样。
4、as if还可用于省略句
如果as if引导的从句是“主语+系动词”结构，可省略主语和系动词，这样as if后就只剩下名词、不定式、形容词（短语）、介词短语或分词。
He acts as if (he were)a fool.
他做事像个傻子。
She left the room hurriedly as if (she were)angry.
她匆忙离开房间好像生气的样子。
as if的用法归纳总结
1、as if后接表语从句。
当as if后接表语从句中，其通常用于“It loos/ems as if…”的句型中，表示“看起来似乎……”。
2、as if后接状语从句。
当as if后接状语从句，其含义为“似乎，就好像……”。当所描述的内容，是真实的或极有可能发生或存在的事实，从句通常用陈述语气，句子的谓语用look，em，taste，smell，feel等。
3、as if后从句也可以用虚拟语气。
as if的谓语动词有时也要使用虚拟语气，用来表示句子中所描述的情况与事实相反，或极少情况发生的情况。
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 与as though 是一组同义词，两者意思相同，用法也相同，只是在口语中人们多半会用as if, 取其简短。as if
和as though 用法较为复杂，本文拟对其各种用法做一概述。
1．在通常情况下， as if 和as though 所引导的从句的谓语动词多用虚拟语气，表示所叙述的情况与事实相反。具体用法如下：
1)谈论现在情形的，用过去时（动词be用were,也可用was）：
Why is she looking at me as though she knew me? 他为什么那样看我？像是认识我似的。
He behaves as if he owned the hou. 他的样子好像他拥有这个房子。
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)谈论过去情形的动词形式有以下几种：
a)过去式，表示过去的状态，如：
He looked at me as if I were mad. 他那样看我，好像我是个疯子。
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，望着火车哈哈大笑，好像误了火车是天底下最开心的事儿似的。
Mr. Coleman always talked as if he knew everything.
但是，如果状态动词带有持续时间状语，则用过去完成时：
They talked as if they had been friends for years. (高二册，第95页)
(试比较：They had been friends for years.)
Now it is as though she had known Millie for years. (《现代英语用法词典》)
情态动词亦用过去时：
She felt as though she could hardly endure such a life.
她觉得简直无法忍受这样的生活。
b)过去完成时，表示过去的动作先于主句动词而发生或完成，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.”（高二册，第91页）
必须注意的时，在指过去的动作时，即使主句是现在时，as if 从句中的动词也要用过去完成时：
You look as if you’d en a ghost. 你好像是见了鬼似的。
He talks about Rome as though he had been there himlf.
他讲起罗马的情况来就好像他亲自到过那里似的。
c)过去进行时，表示动作正在进行：
He heard a noi, as if someone was breathing.（高一册，第211页）
He ran as if ghosts were chasing him.
I felt as if the ground were slipping beneath my feet. 我感到大地仿佛在脚下滑动。
d)过去将来时，表示将要发生的事态：
It looked as if it was going to snow. （高一册，第127页）
He opened his lips as if he would say something to you.
2. 如果as if后面的从句所表示的情况时真实的或很可能时真实的，则动词可以用陈述语气，在feel, look, em
smell, sound, taste之后尤其如此。试比较：F. T. Wood所著English Colloquial
Idioms中的两个例子：
He walks as if he is drunk.
He walks as if he were drunk.
第一句表示“他已经醉了”，第2句则表示“他没有醉”。又如：
It looks as if it is going to rain.
It looks as if were going to rain.
第一例意味着快要下雨了，第二例则意味着不会下雨。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，霍布正在同检票员说话，看样子还没弄到站台票。
You look as if you’ve been running. 你好像刚跑了一阵似的。
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. 闻起来很新鲜。
3. 随着语言的发展，as if
后面的从句即使反映的不是事实，也可以不用虚拟语气而用陈述语气，这主要出现在口语或不太正式的文体中。例如：
With the development of the new tools, it is as if man has
suddenly become a millionaire of the mind.
随着这些新工具的发展，人好像突然间成为精神上的百万富翁似的。
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. 在非正式文体（尤其是美国英语）中，可以用like做连词代替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.
她开始吻我，好像是在度蜜月似的。
5. as if和as though从句中的省略
当as if和as though从句的主语与主句一致时，该主语和后面的动词可以省略。于是便出现下面几种结构：
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. 蜜蜂放慢飞行速度，转了几圈儿，然后在清澈如镜的水潭上空慢慢地飘过，似乎要欣赏它自己的倒影。
2) 不定式+形容词或形容词短语
Carrie felt as if unable to endure such a life. 嘉莉觉得似乎无法再忍受这种生活了。
He lay still for a long while, as if dead.
3) as if +介词短语
He looked about as if (he was) in arch of something.
4) as if +现在分词
From time to time Jason turned round as though (he was) arching
for someone.
John paud as if expecting Mary to speak. 约翰停下来，似乎是等玛丽开口。
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动着它地翅膀，仿佛在估量着所受的损害。
5) as if +名词
He acts as if (he was) a fool.
6) as if +副词
He made that remark as if abntly. 他好像是漫不经心地说了那句话。
6. 对as if-从句认识上的一个误区
对于as if 的用法，一些人的认识上存在着一个误区，即把as
if从句中动词的形式与主句的时态相联系。如1993年第10期《英语自学》中《浅谈由as if (as
though)和wish引出的虚拟语气就明确指出：“在由as if (as
though)引出的表示虚拟语气的方式状语从句中，如果主句的谓语是一般时，那么其从句的谓语一般应该用动词的过去式
(be用were)；反之，如果主句的谓语用一般过去时，那么从句谓语一般用“had
+过去分词”。这种认为从句动词形式受主句时态制约的观点是不符合语言实际的。实际上，as if和 as
though后谓语动词的形式与主句时态无关。本文前面列举的一些例句足以证明这一点，《现代英语惯用法词典》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.
我们在前面也有过类似的例句。下面在提供一些主句用现在时而从句仍用过去完成时的例句：
A: We’ve been back at work now for three days. 我们回来上课到现在已三天了
B: I feel as if I had been back for three months. 我感到似乎已回来三个月了。
（比较：I have been back for three months.）
6. as if和as though的功能
1) 引导方式状语从句
They talked as if they had been friends for years.
2) 引导表语从句
He looked as if he had just stepped out of my book of fairy
tales and had pasd me like a spirit. (高二册，第92页)
3) 引导感叹句，表示对某种建议、假定、想象等的反对：
As if I cared! 好像我很在乎似的！（相当于：I don’t care!）
As if anyone would believe that story! 好像人人都会相信那种说法似的！
He warned me against associating with people of doubtful character.
As if I ever should! 他告诫我不要同可疑的人来往，好像我真会那样做似的！
as if用于什么时态？
as if,as though的用法：
这两个复合从属连词的用法和意义完全一样,但as if 在当代英语中比 as though 普通得多.
as if 引出的方式状语从句所表示的情况是事实或具有很大可能性时,通常用直陈语气.名子的谓语我为look,em,taste,smell,sound等.如：
It looks as if they have succeeded in the experiment.看来好像他们试验成功了.
as if 引出的方式状语从句所表示的情况不是事实,而是主观想象或夸大性的比喻时,通常用虚拟语气.从句中谓语动词一般用过去时,be 动词常用 were,但在现代英语中也常见到单数 was的情况.如：
The young man with long hair looks as if he were a girl.这位满头长发的男青年看上去像个女的.
The injured man acted as if nothing had happened to him.这位受伤的男子表现得好像没发生什么事一样.
as if 引出的方式状语从句,当主句谓语是过去时态时,从句谓语形式常常没有什么特殊之处.如：
The lady felt as if she lost something.这位女士好像学得丢了什么东西.
He was singing as though / if he hadn't had / didn't have a care in the world.他唱着歌,好像人世间他没有忧虑.
as if 引导的同一从句中所用的时态不同,意思往往不同.请比较：
The clown looks as if he were ill.那个小丑好像害病似的.（虚拟语气）
The clown looked as if he had been ill.那个小丑过去好像生过病.（过去生过病或虚拟语气）
希望对你有帮助
asif的用法？？？？？？
as if 的用法 as if 好像，好似 She spoke to me as if she knew me. 她和我说话的神情，好像她早就认识我似的。 (= as though)as if 的用法 一、as if 从句的作用 1． 在look, em 等系动词后引导表语从句。如： She looks as if she were ten years younger． 她看起来好像年轻了十岁。 It ems as if our team is going to win． 看来我们队要胜了。 2． 引导方式状语从句。如： She loves the boy as if she were his mother． 她爱这男孩，就好像她是他的母亲一样。 The child talked to us as if he were a grown?up． 那孩子跟我们谈起话来，像个成年人似的。 二、as if 还可用于省略句中 如果as if 引导的从句是“主语＋系动词”结构，可省略主语和系动词，这样as if 后就只剩下名词、不定式、形容词（短语）、介词短语或分词。如： He acts as if （he was） a fool． 他做事像个傻子。 Tom raid his hands as if （he was going） to say something． 汤姆举起手好像要说什么。 She left the room hurriedly as if （she was）angry． 她匆忙离开房间好像生气的样子。 三、as if 从句的语气及时态 1． as if 从句用陈述语气的情况。 当说话者认为句子所述的是真实的或极有可能发生或存在的事实时。如： It sounds as if it is raining． 听起来像是在下雨。 He talks as if he is drunk． 从他谈话的样子来看他是醉了。 2． as if 从句用虚拟语气的情况。 当说话人认为句子所述的是不真实的或极少有可能发生或存在的情况时。从句虚拟语气动词时态的形式如下： （1）如果从句表示与现在事实相反，谓语动词用一般过去时。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． 他说话的样子，好像他知道她在哪里似的。 （2）从句表示与过去事实相反，谓语动词用“had＋过去分词”。如： He talks about Rome as if he had been there before． 他说起罗马来好像他以前去过罗马似的。 The girl listened as if she had been turned to stone． 那女孩倾听着，一动也不动，像已经变成了石头似的。 （3）从句表示与将来事实相反，谓语动词用“would／could／might＋动词原形”。如： He opened his mouth as if he would say something． 他张开嘴好像要说什么。 It looks as if it might snow． 看来好像要下雪了。
asif引导什么状语从句？
1、在look，em，smell，taste，sound等连系动词后面as if引导表语从句。
如：She looks as if she were ten years younger.她看起来好像年轻了十岁。
2、如果主句的谓语动词不是联系动词be等，as if引导的则是方式状语从句。
如：The child talked to us as if he were a grow-up.那孩子跟我们谈起话来，像个成年人似的。
如果as if引导的从句是“主语＋系动词”结构，可省略主语和系动词，这样as if后就只剩下名词、不定式、形容词（短语）、介词短语或分词。例如：He acts as if he werea fool.他做事像个傻子。
扩展资料
as if的用法
1、as if从句用陈述语气的情况。当说话者认为句子所述的是真实的或极有可能发生或存在的事实时。
如：It sounds as if it is raining.听起来像是在下雨。He talks as if he is drunk.从他谈话的样子来看他是醉了。
2、as if从句用虚拟语气的情况。当说话人认为句子所述的是不真实的或极少有可能发生或存在的情况时。
