in order to 同 so as not as的分別係??

應該係in order to
同so as to
其實兩個意思一樣
不過in order to可以放在句子開頭或中間去連接兩句
e.g. In order to have a good result in the test, I have done a lot of revision.
e.g. I have done a lot of revision in order to have a good result in the test.
so as to就只可以放係中間
e.g. I have done a lot of revision so as to have a good result in the test.

So as to should be placed in the middle of the sentence.

I want to finsih my homework so as to hang out with my frds~~~