YOU SAID:

I'm going to sleep in history class if it doesn't end soon

INTO JAPANESE

歴史の授業が早く終わらなければ寝るつもりだ

BACK INTO ENGLISH

I'm going to bed if I don't finish my history class early.

INTO JAPANESE

歴史の授業を早く終わらなければ寝るつもりです。

BACK INTO ENGLISH

If I don't finish my history class early, I'm going to bed.

INTO JAPANESE

歴史の授業を早く終わらなければ、もう寝るつもりです。

BACK INTO ENGLISH

If I don't finish history class early, I'm going to bed.

INTO JAPANESE

歴史の授業を早く終わらなければ、もう寝るつもりです。

BACK INTO ENGLISH

If I don't finish history class early, I'm going to bed.