YOU SAID:

I have homework, but I'm doing this instead.

INTO JAPANESE

私は宿題が、代わりにこれをやっています。

BACK INTO ENGLISH

I am doing this instead of homework.

INTO JAPANESE

私は宿題ではなくこれをやっています。

BACK INTO ENGLISH

Homework, but I am doing this.

INTO JAPANESE

宿題が、私はこれをやってる。

BACK INTO ENGLISH

Homework, I'm doing this.

INTO JAPANESE

宿題、私はこれをやってる。

BACK INTO ENGLISH

Homework, I'm doing this.