YOU SAID:
Yeah I don't think he understands that either
INTO JAPANESE
うん、私は彼がどちらかを理解しているとは思わない
BACK INTO ENGLISH
Yeah, I do not think he understands either
INTO JAPANESE
ええ、私は彼がどちらかを理解しているとは思わない
BACK INTO ENGLISH
Yeah, I do not think he understands either
You've done this before, haven't you.