给定一篇文章，将其中的语法错误标出并提供修改建议。


"John drive to the store and buy some groceries. Then, he returns home."
文章中应将"drive"改为"drives"，将"buy"改为"buys"，并将"returns"改为"returns home"。修改后的句子为： "John drives to the store and buys some groceries. Then, he returns home."