How can these sentences be translated into English? Are they questions or afirmative sentences?
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They're all questions.
1-洗没洗衣服 = Have you washed the clothes or not?
2-听没听音乐 = Have you listened to music or not?
3-复习没复习课文 = Have you revised the text or not?
All three sentences have the same structure. If you break the first one apart, you get this:
洗 = wash(ed)
没洗 = not wash(ed)
衣服 = clothes