就便

jiù biàn gěi wǒ mǎi diǎn xiāng jiāo

就便给我买点香蕉。

While you're at it, buy me some bananas.

jiù biàn yě tì wǒ mǎi yī běn

就便也替我买一本。

While you're about it, buy me a copy too.

jiù biàn tàn wàng péng you

就便探望朋友

look around for friends

jiù biàn mǎi běn shū

就便买本书

While you're at it, buy a book.

nǐ shàng jiē jiù biàn bǎ zhè fēng xìn fā le ba

你上街就便把这封信发了吧。

Mail this letter for me when you go out.