YOU SAID:
He's not as smart as he think he do.
INTO JAPANESE
彼は自分が思っているほど賢くない。
BACK INTO ENGLISH
He is not as smart as he thinks he is.
INTO JAPANESE
彼は自分が思っているほど賢くない。
BACK INTO ENGLISH
He is not as smart as he thinks he is.
You've done this before, haven't you.