Common Usage & Traps
- 上课 — to attend class / to teach class
- 下课 — class is over
- 去上课 — go to class
- 汉语课 — Chinese class
- 上汉语课 — take Chinese class
- 上课的时候 — during class
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去课去上课You need 上 before 课 when you mean attending or having class. 去课 sounds like you are going to a thing called 课.
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上课汉语上汉语课The subject goes between 上 and 课. Say 上汉语课, not 上课汉语.