YOU SAID:
I don't comprehend and I am so stupid.
INTO JAPANESE
私は理解していないし、私はとても愚かです。
BACK INTO ENGLISH
I do not understand and I am very stupid.
INTO JAPANESE
私は理解していないし、私は非常に愚かです。
BACK INTO ENGLISH
I do not understand and I am very stupid.
You've done this before, haven't you.