so that 何时是“为了”,何时是“以至于”?so that 既可以引导目的状语,“为了”;又可以引导结果状语,“以至于”.请问如何区分出两者?需要例句.

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so that 何时是“为了”,何时是“以至于”?so that 既可以引导目的状语,“为了”;又可以引导结果状语,“以至于”.请问如何区分出两者?需要例句.
so that 何时是“为了”,何时是“以至于”?
so that 既可以引导目的状语,“为了”;又可以引导结果状语,“以至于”.请问如何区分出两者?需要例句.

so that 何时是“为了”,何时是“以至于”?so that 既可以引导目的状语,“为了”;又可以引导结果状语,“以至于”.请问如何区分出两者?需要例句.
1 so that
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”.如:The little boy saved every coin so that he could buy his mother a present on Mother's day.
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……”.如:When the football fans saw Beckham,they got so excited that they cried out.

so .............that :如此 。。。。。以至于
so that :以便