Какая вторая форма глагола? are, play, skate, watch tv, visit, wrate

Are -  was, play -  played, skate-  skated, watch tv - watched tv, visit - visited, write - wroteare(do) и write - неправильные глаголы, их формы надо выучить. а остальные глаголы правильные и образуются по правилу)

mary used to eat junk food when she was a child but now she keeps fit and prefers healthy food.

10 years ago people used to pay only in cash, but today most people have credit cards.

seven years ago i used to have a motorbike, but now it belongs to my sister as i drive a car.

when he lived in paris, he used to eat frogs every weekend, but now he lives in india and he eats indian food every second day.

when her granddaughter was a kid she used to believe that snow was made of ice cream.

i bought a  book about animals last week.

i made my friend in the street last week.

i read the interesting book last week.

i have wrote the letter to the friend last week.

i sang a cheerful song at a concert last week.