(Modifier +) 同学
The noun 同学 (tóngxué) means "classmate" or "fellow student" and refers to someone who studies at the same school or in the same class. It is a very common word in everyday Chinese and can also be used as a form of address. For example, 嫉妒的同学 means "jealous classmates."
我和几个同学约好了周末一起去爬山。
Wǒ hé jǐ gè tóngxué yuē hǎo le zhōumò yìqǐ qù páshān.
A few classmates and I agreed to go hiking together this weekend.
她是我大学时候最好的同学。
Tā shì wǒ dàxué shíhou zuì hǎo de tóngxué.
She was my best classmate during college.
今天班里来了一位新同学。
Jīntiān bān lǐ lái le yí wèi xīn tóngxué.
A new classmate joined our class today.