YOU SAID:

I studied for my exam tomorrow

INTO JAPANESE

私は私の明日の試験勉強

BACK INTO ENGLISH

I'm studying for my tomorrow

INTO JAPANESE

勉強している私の明日のため

BACK INTO ENGLISH

Because I'm studying for tomorrow

INTO JAPANESE

明日のため勉強していますので

BACK INTO ENGLISH

Have been studying for tomorrow

INTO JAPANESE

明日勉強しています。

BACK INTO ENGLISH

I have been studying tomorrow.

INTO JAPANESE

私は明日勉強されています。

BACK INTO ENGLISH

I have been studying tomorrow.