YOU SAID:

I should start doing my homework now.

INTO JAPANESE

私は今宿題を始めなければならない。

BACK INTO ENGLISH

I must start my homework now.

INTO JAPANESE

宿題、片付けなきゃ。

BACK INTO ENGLISH

I must do my homework.

INTO JAPANESE

宿題、片付けなきゃ。

BACK INTO ENGLISH

I must do my homework.