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虚拟语气中be动词都用were吗
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用在asif/as though, 或evenif/even though引导的从句中: 这时，如果从句中表示的动作发生在过去，则谓语动词用had＋过去分词形式；如果指的时现在的状况，则用过去式 (be用were)；指将来则用would(should,could)+动词原形。这里只看从句动作发生的时间，与主句的时态没有关系。
Forexample:
Some metals look at first sight as though they weregold.
He looked as if he were an artist.
He speaks English so fluently as if he had studiedEnglish in the U.S.
He always sounds as if he would help you.
When a pencil is partly in a glass of water, itlooks as if it were broken.
Even if he were here, he could not solve theproblem.
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as if和as though什么意思
我给你重写一遍吧
首先as
if和as
though是相等的，这里不作区分。
as
if
后面的语气和它引导什么句子没有关系。
as
if引导的从句可以分为以下几种情况：
1、在look,seem
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.
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.
3、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
raised
his
hands
as
if
（he
was
going）
to
say
something．
汤姆举起手好像要说什么.
as
if从句的语气及时态可以分为以下2种情况：
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.
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.
这回你明白了吗？欢迎不懂继问！
as if和as though的虚拟语气的用法
方式状语从句通常由as, (just) as…so…, as if, as though引导。 1） as, (just) as…so…引导的方式状语从句通常位于主句后，但在(just) as…so…结构中位于句首，这时as从句带有比喻的含义，意思是"正如…"，"就像"，多用于正式文体，例如： 1。Always do to the others as you would be done by. 你希望人家怎样待你，你就要怎样待人。 2。As water is to fish, so air is to man. 我们离不开空气，犹如鱼儿离不开水。 3。Just as we sweep our rooms, so we should sweep backward ideas from our minds. 正如打扫房屋一样，我们也要扫除我们头脑中落后的东西。 2） as if, as though
两者的意义和用法相同，引出的状语从句谓语多用虚拟语气，表示与事实相反，有时也用陈述语气，表示所说情况是事实或实现的可能性较大。汉译常作"仿佛……似的"，"好像……似的"，例如： 1。They completely ignore these facts as if (as though) they never existed. 他们完全忽略了这些事实，就仿佛它不存在似的。（与事实相反，谓语用虚拟语气。） 2。He looks as if (as though) he had been hit by lighting. 他那样子就像被雷击了似的。（与事实相反，谓语用虚拟语气。） 3。It looks as if the weather may pick up very soon. 看来天气很快就会好起来。（实现的可能性较大，谓语用陈述语气。） 说明：as if / as though也可以引导一个分词短语、不定式短语或无动词短语，例如： 1。He stared at me as if seeing me for first time. 他目不转睛地看着我，就像第一次看见我似的。 2。He cleared his throat as if to say something. 他清了清嗓子，像要说什么似的。 3。The waves dashed on the rocks as if in anger. 波涛冲击着岩石，好像很愤怒。
as if和as though的区别和用法
一、文法不同
as if 引导的方式状语从句或表语从句，用虚拟语气。
例句： He acts as if he knew me. 他显得认识我似的。
as though 表示与现在事实相反，谓语动词，用would (might, could)+动词原形。
例句：They treat me as though I were a stranger. 他们待我如陌生人。
二、时态不同
as if 表示与过去事实相反，用过去完成时。
例句：This meat tastes as if it has already gone bad. 这肉吃起来似乎已经坏了。
as though 表示将来的可能性不大，用一般过去时。
例句：I feel as though I’m floating on air. 他感到好像漂浮在空中。
三、语境不同
as if 用来描述比较悲惨的境遇或者状况。
例句：It is not as if he were poor. 他不像穷的样子(或他又不穷)。
as though 语境属于中性，可以用到很多情境中。
例句：It is not as though you were going away for good. 又不是你离开不回来了。
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