He is not such a fool as he looks.
I have never heard such a story as he tells.
b."the same ....as"
This is the same book as I lost last week.
(区分"the same...as"与"the same....that"：两者都引导定语从句。that从句中说明的名词与the same修饰的名词是同一个。as从句中说明的名词与the same修饰的名词是同一类，而非同一个。举例：①This is the same pen that I lost. 这支钢笔就是我丢的那一支。②This is the same pen as I lost. 这支钢笔跟我丢的那支笔一模一样。)
As many children as came were given some cakes.
常用句式:as is said above 综上所述
as is known to all 众所周知
as is often the case 通常如此
as is reported in the newspaper 如报纸所报道的
(c)The tree, which is four hundred years old, is very famous here.
We depend on the land from which we get our food.
We depend on the land that/which we get our food from.
(f)先行词指物，在主句中作是“the way”或“the reason”时，“that”可作关系副词，也可省略。
Is this the book that you borrowed in the library?
Who that break the window should be punished.
All that needed is a supply of oil.
The thief gave out everything that he had stolen to the police.