So as to , so that 片語的詞性

請問一下

I come to school in order to/so as to learn more knowledge.
...........................so that I can learn more knowledge.

in order to,so as to,so that,這些片語,算是副詞片語嗎(跟不定詞一樣的功能)?

那後面引領的句子,叫做:修飾主要字句的的副詞子句嗎?

謝謝!
更新: Thank you, Elisa.

(1)
Could you tell me which part of speech "in order to","so as to","so that" are?

(2)
I consider that they all act as "telling why" and modify "come". Is this correct?
更新 2: Elisa,謝謝。

我知道那是說明目的副詞子句。

我的問題點,只在於想知道in order to,so as to,so that這三個片語,應該算什麼詞性呢?

我想說片語也是有詞性的,形容詞片語、副詞片語....等等

還是有別的答案呢?
更新 3: OK...

所以"in order to", "so as to" and "so that"三個片語都是從屬連接詞,因為他們都帶了副詞子句。

這樣對嗎?
更新 4: Elisa我懂了。

in order to/so as to這兩個詞組,沒有主詞,所以是副詞片語。

so that,是副詞子句。

這樣說對嗎?

如果對,我想這就是我的答案了。
更新 5: 可是字典上說,in order to/so as to是片語。

他們加上了learn more knowledge這麼多字後,也還是片語。

我可以說,in order to/ so as to,是片語,但沒有詞性。

加上learn more knowledge後才是副詞片語嗎?
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