1.  not be allowed
2.  mustn't
3.  cannot
4.  shouldn't
5.  be not supposed to

• 1. 不得: Shall Not | may not | cannot | must not
• 2. 不得不: cannot help | cannot couldn't help
• 3. 舍不得: Reluctant | pinch | grudge

更多释义

• 1.未经允许，不得离开岗位。
  You are not to leave your station without permission.
  dict.yoduao.com
• 2.那辆汽车肯定很了不得。
  It must be quite some car.
  dict.yoduao.com
• 3.他们不得不半夜离开。
  They had to leave at midnight.
  dict.yoduao.com

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