有什麼分別 (so,so that)?

so mean所以,
但是so that mean為左,
他們的字是相近,
但意思完全不同.
eg.I will do my homework within a hour so that I can have more time to play.
I will do my homework within a hour so I can have more time to play.
以上兩句句子結構相近,
但意思就不同了.
I will do my homework within a hour so that I can have more time to play
為了可以多玩一會,我會在一個小時內做完功課
I will do my homework within a hour so I can have more time to play.
我會在一個小時內做完功課,所以我可以多玩一會.

so
conj.
因而, 所以, 那么, 這樣看來
adv.
[表示程度] 如此, 那么, 非常, 很, [表示方式] 這樣, 那樣, 如此, 因此
[域] Somalia , 索馬里

e.g.
Hold the pen so.
這樣執筆。
You must not do so.
你一定不要那么做。

so that
conj.
所以
所以, 因要

e.g.
He cries,so that I comfort him.
We need to keep the environment clean so that we wouldn't get sick.