他是我高中的同学。

Tā shì wǒ gāozhōng de tóngxué.

He is my high school classmate.

今天来了一位新同学。

Jīntiān lái le yí wèi xīn tóngxué.

A new classmate arrived today.

我下课后会跟同学一起打篮球。

Wǒ xiàkè hòu huì gēn tóngxué yìqǐ dǎ lánqiú.

After class I will play basketball with my classmates.