I ('ve lost / lost) my key. I can't find it anywhere.
I've lost my key. I can't find it anywhere.
The office is empty now. Everybody (has gone / went) home.
The office is empty now. Everybody has gone home.
Can you help me? My laptop (has broken / broke).
My laptop has broken.
It (has been / was) very cold yesterday.
It was very cold yesterday.
(Did you go / Have you gone) to the party on Saturday?
Did you go to the party on Saturday?
