我刚好经过你家附近，所以想顺便看你有没有空见面。

Wǒ gānghǎo jīngguò nǐ jiā fùjìn, suǒyǐ xiǎng shùnbiàn kàn nǐ yǒu méiyǒu kòng jiànmiàn.

I was just passing nearby your home, so I thought it would be convenient to stop by and see if you have time to meet.

你去超市的时候，可以顺便帮我买牛奶吗？

Nǐ qù chāoshì de shíhou, kěyǐ shùnbiàn bāng wǒ mǎi niúnǎi ma?

When you go to the supermarket, is it convenient for you to help me buy some milk?

我洗澡的时候会顺便刷牙。

Wǒ xǐzǎo de shíhou huì shùnbiàn shuāyá.

When showering I brush my teeth at the same time.