such
1．so．．．that结构中的so为副词,后面跟形容词或副词；such．．．that中的such为形容词,后面接名词（名词前可以有形容词或副词修饰）.例如：
He became so angry that he couldn't speak．
It was such a fine day that we went out for a walk．
2．当that前的名词有表示数量多少的 many,much,few,little等修饰时,只能用so,不能用such.例如：
He had so many falls that he was black and blue all over．
注意：若名词前的little解释为“小（的）”意思时,则仍用such,而不能用so.例如：
It is such a little sheep that it can't run fast．
3．当that前是单数可数名词且该名词前有形容词修饰时,so与such可以互换,
即：so＋adj．＋a／an＋n．＝such＋a／an＋adj．＋n．.例如：
She is so good a teacher that we all love her．＝She is such a good teacher that we all love her．
4．当that前是不可数名词或复数可数名词时,则必须用such,不能用so来代替.例如：It was such fine weather that they all went swimming．
They are such nice apples that we would like to eat them．