YOU SAID:

right now he is doing homework which is not that good

INTO JAPANESE

今、彼は宿題をしているが、それはそれほど良くない

BACK INTO ENGLISH

Now he's doing his homework, but it's not so good.

INTO JAPANESE

今、彼は宿題をしていますが、それはそれほど良いものではありません。

BACK INTO ENGLISH

Now he's doing his homework, but it's not so good.