YOU SAID:

I must run to the market to eat a bird

INTO JAPANESE

私は鳥を食べるために市場に走らなければならない

BACK INTO ENGLISH

I have to run to the market to eat birds.

INTO JAPANESE

私は鳥を食べるために市場に走らなければならない。

BACK INTO ENGLISH

I have to run to the market to eat birds.