— On holidays I went to a camp. I go there every year.
— How long have you visited the camp?
— I've visited the camp since I was 9.
— Isn't it boring?
— No, it's not. We do a lot of different things there.
— What have you done this year?
— We've sewed soft toys.
— I don't think that's very interesting.
— I'm tired.
— What have you done?
— We've picked up garbage near the river.
— How long have you worked?
— We've worked there for 2 hours.
— You can sing really well.
— Thank you.
— How long have you sung?
— I have sung in the choir for 4 years