nǐ / qù / chāo / shì / de / huà / shāo / dài / bāng / wǒ / mǎi / yì / hé / niú / nǎi / ba

你去超市的话，捎带帮我买一盒牛奶吧。

If you are going to the supermarket, please pick up a carton of milk for me.