有空儿的时候，我喜欢打篮球。

Yǒu kòngr de shíhou, wǒ xǐhuān dǎ lánqiú.

When I have free time, I like to play basketball.

你今天下午有空儿一起喝咖啡吗？

Nǐ jīntiān xiàwǔ yǒu kòngr yìqǐ hē kāfēi ma?

Do you have time this afternoon to have coffee together?

老师有空儿的时候，会帮我们改笔记。

Lǎoshī yǒu kòngr de shíhou, huì bāng wǒmen gǎi bǐjì.

When the teacher has time, she helps us correct our notes.