Final answer:
The preposition used to indicate time is 'after'. It is used to express when an action takes place in relation to another event or point in time.
Step-by-step explanation:
The preposition used to indicate time is after. It is used to express when an action takes place in relation to another event or point in time. For example, 'I will see you after school' or 'The party starts after 8 PM'.
Learn more about Preposition indicating time