2020湖南普通专升本英语语法：用so as to do sth表目的

用so as to do sth表目的
so as to do sth是to do sth的变体，意思是“以便”“为了”“为的是”等。用so as to do sth表示目的时，它通常用于句末。如：
I left a message so as to be sure of contacting her.我留下了张条子以便与她取得联系
The two lovers dropped back so as to be alone.那对情人落在后面，为的是两人好单独在一起。
I always keep fruit in the fridge so as to keep insects off it.我总是把水果放在冰箱里，以防虫子叮咬。
2020年普通专升本英语语法
表示目的的so as to do sth有时也可放在句首（但是若so as to do sth是表示结果，则不可放在句首）。如：
So as to show his boss what a careful worker he was，he took extra trouble over the figures.为了向老板显示他是个工作非常细心的人，他在这些数字上费了比平常更多的力气。
so as to do sth的否定式是so as not to do sth，意思是“为了不……”“以免”。如：
They tiptoed upstairs so as not to wake the baby.他们踮着脚上楼，以免吵醒孩子。
We left in the daytime so as not to arouse suspicion.我们在白天离开以免引起怀疑。
I shut the door quietly，so as not to wake the baby.为了不惊醒宝宝，我轻轻地关上门。