Answer: The teacher said to let the parent enter their office.
Step-by-step explanation:
Indirect speech means that the speaker is no longer the one speaking. The view is now that of a third person who in their own words, expresses the action/ speech of the speaker.
In the above therefore, we need to convert the speech from being said by the teacher to being said by you or another third person. The above answer is how that should be done.