上課不能交頭接耳。

You must not talk to each other in class.

Source: Tatoeba

Sentence Composition

1 上課 shàngkè
  1. to go to class
  2. to attend class
  3. to go to teach a class
2 不能 bùnéng
  1. cannot
  2. must not
  3. should not
=3 交頭接耳 jiāotóujiēěr to whisper to one another's ear
=3 交頭接耳 jiāotóujiē'ěr to speak in each other's ears; to whisper to each other