So as to 意思是為了，那麼它跟 So 有什麼關係，為什麼不直接用 To？

so:-adv---so as to--->"so as to "---->used to do something , to show something, to judge something from what he said:- eg:-
I am not so "stupid" as to "believe that"="what he said".
eg:-
Would you be so "kind" as to "lock the door" ------>"when you leave?"

...................等同台灣口語字面的「然後」