YOU SAID:

i think i should have done homework today

INTO JAPANESE

私は今日宿題をしておくべきだったと思う

BACK INTO ENGLISH

I think I should have done homework today

INTO JAPANESE

今日は宿題をしておくべきだったと思う

BACK INTO ENGLISH

I think I should have done homework today.

INTO JAPANESE

今日の宿題を行っている必要がありますと思います。

BACK INTO ENGLISH

I think that we need to do today's homework.

INTO JAPANESE

私は今日の宿題をする必要があると思います。

BACK INTO ENGLISH

I think it is necessary to do today's homework.

INTO JAPANESE

私は今日の宿題をする必要があると思う。

BACK INTO ENGLISH

I think I need to do today's homework.

INTO JAPANESE

私は今日の宿題をする必要があると思う。

BACK INTO ENGLISH

I think I need to do today's homework.