未经许可，我不能喝酒。

I'm not allowed to drink alcohol.

Source: Tatoeba

Sentence Composition

1 未经 wèijīng
  1. not having undergone
  2. without (having gone though a certain process)
2 许可 xǔkě
  1. to allow
  2. to permit
3 我 wǒ
  1. I
  2. me
  3. my
4 不能 bùnéng
  1. cannot
  2. must not
  3. should not
5 喝酒 hējiǔ to drink (alcohol)