YOU SAID:
the duck went down to the butcher shop to buy his brother
INTO JAPANESE
アヒルは兄を買うために精肉店に行きました
BACK INTO ENGLISH
The duck went to a butcher shop to buy his brother
INTO JAPANESE
アヒルは兄を買うために精肉店に行きました
BACK INTO ENGLISH
The duck went to a butcher shop to buy his brother
That didn't even make that much sense in English.