YOU SAID:

Because I really do not want to do homework, I will probably get a worse grade in English class.

INTO JAPANESE

宿題をしたくないので、英語の授業でもっと成績が悪くなるでしょう。

BACK INTO ENGLISH

I don't want to do my homework, so my grades will be worse in English class.

INTO JAPANESE

宿題をしたくないので、英語の授業で成績が悪くなります。

BACK INTO ENGLISH

I don't want to do my homework, so my grades get worse in English class.

INTO JAPANESE

宿題はやりたくないので、英語の授業で成績が悪くなる。

BACK INTO ENGLISH

I don't want to do my homework, so my grades get worse in English class.