not at teacher
'Saw' and 'watch' causative verbs.
They are followed by the person, then the 'base form of the verb'. The base form is the root word without tenses.
Other examples of causative verbs:
The teacher made the students stay back after class.
Peter made her do her homework.
Anyway, it doesn't sound natural if you say this, does it?
Peter made Mary did her homework.