Question

1. He bought/has bought a new computer last week.
2. Dad hasn't come home from work already/yet.
3. Don't go into the kitchen. I just cleaned/have just cleaned the floor.
3. I have seen/saw Maria Callas.
4. This jacket costs/ is costing a lot of money. I can't afford it.

Answer 1

1) Bought
2) yet
3) have just cleaned
4) saw
5) costs