YOU SAID:

i have to do a lots of homework

INTO JAPANESE

私はたくさんの宿題をしなければなりません

BACK INTO ENGLISH

I have to do a lot of homework

INTO JAPANESE

宿題がたくさんある。

BACK INTO ENGLISH

I have a lot of homework to do.

INTO JAPANESE

しなくてはならない宿題がたくさんある。

BACK INTO ENGLISH

I have a lot of homework to do.