do so

:also, do too
to do something ( despite anything to the contrary ) - an emphatic way of saying do

to do so
برای انجام اینکار

I agree to do so من موافقم این کار را انجام دهم

Used for emphasis to insist that one does, has done, or has something. The phrase typically ends the sentence or is followed by a verb.
A: "I don't think you finished your homework. " B: "I did so!"

do so شکل رسمی تره do it و do that است.
do so رو میتونیم برای جلوگیری از تکرار فعلی که قبلا استفاده شده، بکار بریم.
مثلا:
He asked me to get out and I did so without protesting.
اون از من خواست بریم بیرون و من بدون اعتراض رفتم باهاش.