一、so是副词,修饰形容词和副词;而such是形容词,修饰名词。 它们后面都接单数可数名词,但词序不同。
1.so的词序为:so+adj.+a(an)+n.
2.such的词序为:such+a(an)+adj.+n.
它们可以表达同样的意思,因此它们可以进行同义改写。
(1)so nice a coat=such a nice coat 这么漂亮的一件外套
(2)so interesting a book=such an interesting book 那么有趣的一本书
注意:后面接复数名词或不可数名词时,只能用such,而不能用so。例如:
(1)such beautiful flowers 这么美丽的花
(2)such clever children 如此聪明的孩子
但是,复数名词或不可数名词前有many,few,much,little修饰时,只能用so而不能用such,这是一种固定用法。例如:
(1)so many books 这么多的书
(2)so few people 这么少的人
(3)so much money 那么多的钱
(4)so little milk 那么少的牛奶
二、和that连用时,意思基本一样,但句型结构不同。 so...that...句型结构为:
1.so+adj.(adv.)+that...
2.so+adj.+a(an)+单数名词+that...
3.so+many(few)+复数名词+that...
4.so+much(little)+不可数名词+that...例如:
(1)This book is so interesting that I have read it three times. 这本书如此有趣,我已经看了三遍。
(2)He spoke so fast that we couldn’t understand him. 他说得太快,我们都未能听懂他的话。
(3)It was so hot a day that nobody wanted to do anything. 天气很热,谁都不想干活。
(4)There were so many people that we could hardly move on. 这么多人,我们简直无法继续往前走。
5.such...that...句型结构为:
6.such+a(an)+adj.+单数名词+that...
7.such+adj.+复数名词+that...
8.such+adj.+不可数名词+that...例如:
(1)She is such a pretty girl that everyone likes her.她是个很可爱的小姑娘,大家都喜欢她。
(2)They are such delicious cakes that I want to eat another two. 这么可口的蛋糕,我还想再吃两块。
(3)It is such sweet milk that we all want to drink it. 这么香的牛奶,我们都想喝。
注意:由于so和such后跟单数可数名词时,可以换用,同样so...that...与such...that...也可以进行同义句改写。 如上文中:This book is so interesting that I have read it three times. 可改写成:This is such an interesting book that I have read it three times. It was so hot a day that nobody wanted to do anything.可改写成:It was such a hot day that nobody wanted to do anything.
三、so与that可以直接构成词组so that, 引导目的状语从句和结果状语从句, 表示“以便、以至”的意思。例如:
He worked hard so that he could pass theexams.为了能通过考试,他学习很认真。(但such没有这种用法。)