We chat every day.
We CHATTED every day.
I bought a lot of presents.
I BUY a lot of presents.
We swim on Mondays.
We SWAM on Mondays.
It is my dog.
It WAS my dog.
I run away.
I RAN away.
One day ago
Yesterday
They were sad.
They ARE sad.
Ariana Grande sang a christmas song.
Ariana Grande SINGS a christmas song.