帮我看看as if后面be动词的用法区别He looks as if he were ill.He looks as if he is ill.都是他仿佛病了.还有He looks as if he were sleeping.和He looks as if he is sleeping.都是一个意思,用were的一定是虚拟语气了,但

帮我看看as if后面be动词的用法区别He looks as if he were ill.He looks as if he is ill.都是他仿佛病了.还有He looks as if he were sleeping.和He looks as if he is sleeping.都是一个意思,用were的一定是虚拟语气了,但
帮我看看as if后面be动词的用法区别
He looks as if he were ill.
He looks as if he is ill.
都是他仿佛病了.
还有He looks as if he were sleeping.和He looks as if he is sleeping.都是一个意思,用were的一定是虚拟语气了,但是不用were用is好像也是一样的,具体有什么区别吗?用起来要注意什么吗?

帮我看看as if后面be动词的用法区别He looks as if he were ill.He looks as if he is ill.都是他仿佛病了.还有He looks as if he were sleeping.和He looks as if he is sleeping.都是一个意思,用were的一定是虚拟语气了,但
as if “好像”
可以用虚拟语气,但你举的俩个例子意思绝对不一样!
（1）：他看起来像是病了（其实没病）
（2）：他看起来像是病了（可能有病,可能没有）
虚拟语气表示与事实相反,用时一定根据事实来说!
根据时态能判断是不是虚拟

不用虚拟语气的时候，表示这个情况现实中可能发生，用了虚拟语气，表示现实中不可能发生。
比如，he talks as if he were a native speaker.
The sky looks as if it will rain.(下雨确实可能发生的）
你的这道题我觉得没必要用虚拟语气。

这里已经讲的十分详细了，你的问题也迎刃而解！
as if 的用法
一、as if 从句的作用 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。 It seems as if our team is going to win． 看来我们队要胜了。 2． 引导方...

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这里已经讲的十分详细了，你的问题也迎刃而解！
as if 的用法
一、as if 从句的作用 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。 It seems 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 raised 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。
as if 是连词词组，作“好像”、“好似”解，引导表语从句，用于下列句型中：
It looks/seems as if ....表示“看起来似乎……”。其中It为无人称代词，本身并无词义。looks / seems是连系动词，as if引出表语从句。
It looks as if it is going to show. 看来，要下雪。
It seemed as if the suit was made to his own measure. 这套衣服看来似乎是按尺寸给他定做的。
除此之处，as if也可以引导方式状语从句，修饰主句的谓语，此时从句中的谓语动词常用虚拟语气。 The woman loves the children as if she were their mother.这个妇女爱这些孩子，她好像就是他们的妈妈一样。

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这就是英语和汉语不一样的地方：英语用形来表时态，汉语用时间状语来表时态，所以不要被汉语翻译迷惑了。因为他真正的并没有生病，所以用虚拟语气！