Uses
Past simple is used to...
Talk about past actions that are already finished (mainly)
I talked about my career choice with my family.
talk, -ed
Termination added to verbs when refferred to in the past
-ed
When I was younger, I always ate chocolate after dinner.
Habits/Routines
I saw the latest "How to train your dragon" movie last Friday.
see, irregular
Irregular
In the 14th century people thought the earth was round
Facts/States in te past
Yesterday, the bakery smelled like vanilla.
smell, -ed
smellt, -regionalism
Did you understand the topic?
Did you do your homework?
Did as both past tense conjugation and as an auxiliary