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系动词和that 是什么从句
及物动词就是后面可以直接跟宾语的,不及物就是需要加介词再加宾语的.系动词就be动词及感官动词,that在定语从句中指人时相当于who或者whom ,指物时相当于which,限制性定语从句只能用that 的几种情况
1．当先行词是anything, everything, nothing (something 除外), few, all, none, little,
some 等代词时,或者是由every, any, all, some, no, little, few, much 等修饰时
2. 当先行词被序数词修饰
3. 当先行词被形容词最高级修饰时
(1) This is the best film that I have seen.
4. 当形容词被the very, the only修饰时
(1) This is the very dictionary that I want to buy,
(2) After the fire in his house, the old car is the only thing that he owned.
当先行词指人时,偶尔也可以用who
(3) Wang Hua is the only person in our school who will attend the meeting/
5. 当先行词前面有who, which等疑问代词时
(1) Who is the man that is standing there?
(2) Which is the T-shirt that fits me most?
6. 当先行词既有人,也有动物或者物体时
系动词后面有引导词会是状语从句
没有，系动词后面都是表语从句，如The problem is where we can get so much money.
英语的几种从句,举例说明
有三大类
1.名词性从句 2.定语从句 3.状语从句
名词性从句中分：
1.主语从句：例,it is important to read book.(形主it作主语,真正的主语是to read book)
that air has pressure was known long ago.(关联词that引导的句子that air has pressure作主语从句)
2.宾语从句：I think it necessary that he should do his homework.(形式宾语it引导的)
I'm sure that my test will succeed.(sure后用that引导的宾从)
3.表语从句：系动词后的从句
it may be as you say(be是系动词,后面用as引导的)
this is that he is too young to go to school.(有系动词is,后面由that引导的表语从句)
4.同位语从句：同位语从句是对前面名词的解释说明,如：
The facts that he had done his homework.(事实就是he had done his homework,是对前面the facts的解释,是什么事实)
定语从句：在句子中起定语作用,修饰剧中的名词或代词的从句叫定从
例：the man (who is shaking hands with my father) is my teacher.(括号中就是定从,修饰限定the man)
BeiJin is a city (which has a long history).(括号中是定从,修饰the city)
状语从句：在复合句中担任状语成分的从句叫状语从句
例：I will tell her about that (when i see her).为时间状从
just stay (where you are).为地点状语
Because he is ill,he is absent today.为原因状语
这也很局限,其实要讲的还很多,你可以多看看语法书之类的
as if的用法归纳总结
As if引导的从句可以分为以下几种情况：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。引导方式状语从句，如：She loves the boy as if she were...
as if从句用法
Asif意思是“犹如，好像”，主句用一般现在时的时候，从句有两种情况：
1.如果从句所述符合实际情况或很可能实现的事情，那么从句就用一般时态（一般现在时、一般过去时、一般将来时、现在完成时等，时间立足在现在的是任何时态）。
2.如果从句所述情况是与现实情况不符或不可能实现的事情，那么从句就要用到虚拟语气，这里的虚拟语气的表达形式跟一般过去时的形式一样，但它并不是一般过去时，而是虚拟语气。
as if虚拟语气的用法
有时用虚拟语气，若表示与现在事实相反，谓语动词用一般过去时;若表示与过去事实相反，用过去完成时;表示将来的可能性不大，用would(might,could)+动词原形。
(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，也可能用陈述语气：
I feel as if [as though] I'm floating on air.他感到好像漂浮在空中。
The stuffed dog barked as if it is [were, was] 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 he were poor.他不像穷的样子(或他又不穷)。
It isn't as if you were going away for good.又不是你离开不回来了。
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