in order to +动词原形引导目的状语。

so as to +动词原形 / to+动词原形都可以引导目的状语。

有时为了表示强调,也可以将in order to do / to do 等放在句首,而so as to do 一般不放在句首,也比较口语化。表达否定的目的时,可以用in order not to do和so as not to do 这两种结构。例: 　　

In order to (=to) hear more clearly, we moved to the front row.

为了听得更清楚,我们挪到了前排。　　

He ran quickly in order not to (= so as not to) be late for the meeting.

他跑得很快,以便(为的是)不迟到。 

  义务教育英语课程标准五级词汇表(点击每一个单词，可直接链接到这个单词的用法.)

1. We should exercise more so as to have a strong boday .(同义句）

    We should exercise more                                       have a strong boday .

Keys:

1. in order to