1) I have watered the trees in my garden.
а) I haven't watered the trees in my garden.
b) Have I watered the trees in my garden?
2) My little brother has washed up.
a) My little brother hasn't washed up.
b) Has my little brother washed up?
3) My granny has cleaned the carpet.
a) My granny hasn't cleaned the carpet.
b) Has my my granny cleaned the carpet?
4) He has locked his car.
a) He hasn't locked his car.
b) Has he locked his car?
5) My friends have shopped in Oxford Street.
a) My friends haven't shopped in Oxford Street.
b) Have my friends shopped in Oxford Street?