Question

The teacher said to them don't write on your desks

Answer 1

The teacher forbade them to write on their desks.

Explanation:

• Direct speech consists of exact words spoken by the narrator while indirect speech does not contain the original words said by the speaker.  
• This is a direct speech and the indirect speech is given below.
• The teacher forbade them to write on their desks.
• This is a negative sentence.
• According to the rules of the narration change from direct to indirect form "Do Not" is changed into "forbade".