YOU SAID:

I only have to do science class and then i will be done for the day.

INTO JAPANESE

理科の授業をするだけで、その日は終わります。

BACK INTO ENGLISH

All you have to do is take a science class and the day is over.

INTO JAPANESE

あなたがしなければならないのは科学の授業を受けることだけで、一日は終わりました。

BACK INTO ENGLISH

All you had to do was take a science class and the day was over.

INTO JAPANESE

あなたがしなければならなかったのは科学の授業を受けることだけで、その日は終わりました。

BACK INTO ENGLISH

All you had to do was take a science class and the day was over.