377　in order to，so as to和in order that 都可表示目的，意为“为了，以便”

① in order to+动词原形和so as to+动词原形都可以放在句中。

She got up early in order to/so as to/catch the first bus. 她早早起了床，以便赶上头班车。

The doctors gave her a general checkup so as to/in order to find out the cause of her illness. 医生给她做了全身检查，以便找出她的病因。

② in order to可放在句首，而so as to则不可。

In order to win the watch，they practised hard. 为了赢得比赛，他们刻苦训练。

In order to get good results，we ought to do our best to study the lessons. 为了获得好成绩，我们应尽最大努力学好课程。

③ so as to可分开用，而in order to则不可。

The teacher spoke so slowly as to be understood by the students. 老师说得很慢，以便学生能听得懂。

The policeman ran so fast as to catch the robber. 那位警察跑得很快，以便能抓住抢劫犯。

④ so as to有否定形式 so as not to，而in order to则没有。

She went in quietly so as not to wake the baby. 她轻轻地进去，以免把婴儿吵醒。

He started early so as not to be bate. 他早早动了身，以免迟到。

⑤ in order that后跟从句，引导目的状语从句，相当于 so that，句中谓语常含有 can，may，might，could 等情态动词。

I lent her some money in order that she could go for a holiday. 我借给了她一些钱，以便她能去度假。

He saved much money in order that he might buy a car. 他存了许多钱，以便能买辆车。

提示

如果 in order that 所引导的从句主语同主句主语一致，可以转换为 in order to+动词原形结构。

我们学习知识，这样，我们就能变得聪明起来。

We learn in order that we can become wise.

提示

so…as to 可引导结果状语从句，相当于 enough to。

The explosion was so loud as to be heard twenty miles away. 爆炸声很大，20英里外都听得见。（=loud enough to be heard）

He studied so hard as to catch up with his classmates. 他刻苦学习，赶上了同学。（=hard enough to catch up with）