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一些关于定语从句的问题

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一些关于定语从句的问题
She will marry as healthy a man as she can find . 她将嫁给她能找到的任何一个有钱人
as.as不是和什么什么一样么?
还有就是
as引导非限制性定语从句,指代整个主句内容,从句可置于句首,句中或句尾
这是不是意味着用法和which一样?
Tom works hard and is willing to help others, as we all know.
好像这句
句中的as是否可以用which代替?
那这句是否不可以呢?
As everyone knows ,China is a beautiful country with a long history
我们老师说过从句置于句首必定用as
as we had expected 这句话的主句哪去了?
as引导非限制性定语从句,指代整个主句内容,从句可置于句首,句中或句尾
which引导非限制性定语从句,指代整个主句内容,从句只能置于主句之后, 且与主句之间用逗号隔开.

当as引导非限制性定语从句,指代整个主句内容,且从句置于句尾时, 有些情况可同which互换,
如: He saw the girl, as /which he had hoped.

但有些情况不能.如:Tom works hard and is willing to help others, as we all know.中的
as we all know就不要换成which we all know.

因为在句法上,as常用作一些实意动词(如see, know, hear, watch, remember, say, tell, show, expect, guess等)的宾语,这类动词与as几乎成了一种固定搭配.又如:

Einstein, as we know(=as is well known), is a famous scientist.
众所周知,爱因斯坦是一位著名的科学家.

There was a net bar around here, as I remember.
我记得这儿附近有一家网吧.

As everyone knows ,China is a beautiful country with a long history中的
as不能换成which, 因为从句置于句首必定用as.
as we had expected 这句话的主句哪去了?
这只是一个从句,主句没有写出来. 不过这句话可以单独使用.

She will marry as healthy a man as she can find中第二个as引导定语从句修饰man.
as healthy a man as she can find一个她能找到的健康的人.

healthy不是"有钱的",而是"健康的". wealthy才是"有钱的".
再问: as...as 的意思不是 和...一样么??那么这里healthy前的as是起什么作用??
再答: 这儿的as...as ...不能当作"和...一样"来理解. 比较: as+adj./adv.+as 和...一样.. 如: Li Ping works as hard as Wang Wei. She is as careful as you . She will marry as healthy a man as she can find . 此句中的第一个 as 是修饰先行词a man 的, as healthy a man =such a healthy man 第二个as 是作定从的关系代词,并在定从中作find的宾语,也是指代的先行词a man . 语法规则如下: the same, as, such, so修饰先行词,需选择as做关系代词在定语从句中做主语或宾语。 1. It’s the same person as we wanted to find yesterday . 我们昨天要找的是同一个人。 2. Such girls as he knows are good at English . 他所认识的女孩都擅长英语。 3. Do you have such books as we like ? 你有我们喜欢的那种书吗?