Past simple vs. present perfect

I ate pizza yesterday

• past simple

• present perfect

Have you been to Canada?

• Yes, I have been there before

• No, I didn't go

When I was 18 I moved to Chile

• Past simple

• Present perfect

We didn't have cellphones

• present perfect

• past simple

She hasn't graduated from High school

• past simple

• present perfect

My mother has bought me a car

• Did you get a license?

• Have you gotten a license yet?

I have been learning English since I was a child

• I learnt English at 10 years old

• I am still learning

When I was 22 years old I graduated from college

• I graduated a year ago

• I have been at college since I was 22 years old

I had my first job at 16 years old

• I started to work at 16

• I haven't worked yet

I cut my hair at 18 years old

• I have cut my hair

• I cut my hair a week ago