I ___________ a cold since last week. (have)
I have had a cold since last week.
I _______________ London 4 times. (visit)
I have visited London 4 times.
My brother ________________ a car before. (not drive)
My brother hasn't driven a car before.
Mr. Fred ___________ a new motorbike. (not buy)
Mr. Fred hasn't bought a new motorbike.
