我顺便去超市买了一些牛奶。
wǒ shùnbiàn qù chāoshì mǎi le yīxiē niúnǎi 。
I conveniently went to the supermarket to buy some milk.
他顺便帮助我完成了作业。
tā shùnbiàn bāngzhù wǒ wánchéng le zuòyè 。
He conveniently helped me finish my homework.
我顺便问一下,你今天晚上有空吗?
wǒ shùnbiàn wèn yīxià , nǐ jīntiān wǎnshàng yǒukōng ma ?
I wanted to ask conveniently, are you free tonight?