YOU SAID:
I went to the shops to buy yogurt
INTO JAPANESE
私はヨーグルトを買うために店に行った
BACK INTO ENGLISH
I went to a shop to buy yoghurt
INTO JAPANESE
私はヨーグルトを買うために店に行った
BACK INTO ENGLISH
I went to a shop to buy yoghurt
That didn't even make that much sense in English.