1. as we can，imagine是什么从句？
非限制性定语从句
例句：
As you can imagine,things are really different from the way they are at home
as you can imagine是as引导的非限制性定语从句,关系代词as在句子中作的宾语, 代替 后面的主句内容 引导定语从句并作定从中的宾语things是主句的主语are是主句的系动词really different 是主句的表语from the way 是状语they are at home是省略关系词的定语从句 ，修饰the way.
例句：
So as you can imagine，if your skin gets burned it can be very serious.
因此，正如你可以想象得到的，如果你的皮肤烧伤了，就可能非常严重。
as引导非限制性定语从句，指代整个主句内容，意为“正如/就像……”。
As we know，her marriage is considered to be a political trick.
正如我们所知道的，她的婚姻被看成是政治游戏
2. astheyare是什么意思？
as they are是一个非限制性定语从句，意思是“正如他们一样”。 关系代词as引导定语从句时，等于which fact，前面有逗号，因此它引导的是一句非限制性定语从句，可出现在句首、句中或句尾，并且没有明显的先行词，这句非限制性定语从句修饰的是前面的一整句句子。as在定语从句里可以作主语、宾语和表语。如： The earth is round, as is known to all. The elephant is like a snake, as everybody can see. Oil and water don't mix, as we all know.
3. 用英语表达春夏秋冬的活动？
Springiswarm,grassisgrowinganflowerscomeout.Summerishot.wecangotoriversforswimming.Autumnisaharvestseason,cropsandfruitgetripe,inthisseason,wecaneatmanyfreshthings,suchascorn,date,apples,pearsandsoon.Winterisverycold,inthisseasonwehavetowearmoreclothestokeepwarm.Butinthisseasonthereissomethinggoodtoo,suchaswecanseenicesnowflakes.Wecanmakesnowmen,anditisfreezing,sowecangotoskate,howfunweareinwinter.
4. that和as的区分？
as引导的定语从句表示它的内容与主句所讲的事物“相似”，即指同类的事物；that引导的定语从句表示它的内容与主句所讲的事物是“同一的”，即指同一事物。它们的前提都是在主句中有the same。 as 一般引导非限制性定语从句，that 一般引导限制性定语从句。
as 可以引导一个属于附加说明性质的定语从句，as代指整个主句的内容并在定语从句中作主语、宾语或表语。这种as定语从句可放在主句的前边或后边，并有逗号和主句隔开。常见的由as引导的这类定语从句有：
as has been said before 如上所述。
as may be imagined 正如可以想象出来的那样。
as is well known 众所周知。
as was expected 正如预料的那样。
as has been already pointed out 正如已经指出的那样。
as we all can see 正如我们都能看到的那样。
