Question

the headmaster forbade the students to write on the wall into direct speech

Answer 1

The headmaster said to the the students ," stop writing on the wall".

Answer 2

Answer:

For changing into direct to indirect speech, the headmaster was forbade the students to write on the wall can be written as the students are forbade to write on the wall by headmaster.

It is very easy to change in accordance to change subjective and denotes proper meaning.

Therefore, the headmaster forbade the students to make noise and write on the wall.