YOU SAID:
I'm not sure that we understand this website
INTO JAPANESE
このウェブサイトを理解しているかどうかわかりません
BACK INTO ENGLISH
I don't know if I understand this website
INTO JAPANESE
このウェブサイトを理解しているかどうかわかりません
BACK INTO ENGLISH
I don't know if I understand this website
You've done this before, haven't you.