so as to +动词原形"为了"
它们可以互换
如
He got up early yesterday so that he could catch the early bus.
=He got up early yesterday so as to catch up with the early bus.
正确的是
如
He got up early yesterday so that he could catch the early bus.
=He got up early yesterday so as to catch the early bus.
他昨天早起是为了赶上早班车。
祝你新年快乐,请采纳!