so...
1.引导目的状语从句时,表示“以便；为了”,从句中常使用can/could/may/might/will/would/should等情态动词或助动词；引导结果状语从句时,从句中一般不用can和may等词,在so that前可以用逗号,意思是“因此;所以”2.so...that..，so＋形容词或副词＋that...引导结果状语从句.意思是“如此……以致于……”.
例句The little boy saved every coin so that he could buy his mother a present on Mother\'s day.
小男孩存了每一个硬币，以便在母亲节给母亲买礼物。
When the football fans saw Beckham,they got so excited that they cried out.
当球迷看到贝克汉姆时，他们激动得哭了起来。