so as to; in order to; so…as to
so as to与in order to二者均表示“以便;为了”,后接动词不定式作目的状语,可以换用;但so as to引导的目的状语不能置于句首,而in order to则可以。如:
He stopped working in order to/so as to take a rest.他停止工作以便休息。
In order to make a living, he had to work day and night.为了谋生,他不得不日夜工作。
“so+形容词/副词+as to”的意思是“如此的……以致于”,引导表示结果的状语。如:
He ran so fast as to get a pain in his side.他跑得太快,结果导致腹侧疼痛。