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youweren'tsupposedtobelistening.为什么不直接supposedtolisten,怎么理解belistening?

题目详情
you weren't supposed to be listening.为什么不直接supposed to listen,怎么理解be listening?
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答案和解析
虚拟语气固定用法啊
  表示对将来情况的主观推测
  从句:①if+主语+were to do 主句:①主语+should/would/could/might+do
  ②if+主语+did/were ②主语+should/would/could/might+do 
  ③if+主语+should+do ③主语+should/would/could/might+do