In order to - pentru a.....
ex : In order to do my homework i had to Study.
So that si so as to înseamnă același lucru. Uite câteva exemple:
I had to Close my phone so that i Could concentrate.
We took off our shoes so as to avoid scratching the newly finished floors.
Sper ca am ajutat,daca nu ai înțeles ceva,intreaba. :)