YOU SAID:

could you come to the store with me and buy some candy

INTO JAPANESE

私と一緒に店に来て、お菓子を買ってくれる

BACK INTO ENGLISH

Will you come to the store with me and buy me sweets?

INTO JAPANESE

一緒に店に来て、お菓子を買ってくれませんか。

BACK INTO ENGLISH

Will you come to the store with me and buy me some sweets?

INTO JAPANESE

一緒に店に来て、お菓子を買ってくれませんか。

BACK INTO ENGLISH

Will you come to the store with me and buy me some sweets?