I ___ (be) to five countries by the time I was ten.
I had been to five countries by the time I was ten.
Wear
Worn
We ___ (wait) for Ali for over three hours before he finally arrived.
We had been waiting for Ali for over three hours before he finally arrived.
I arrived here only a short time ago. I am here since last Friday.
I arrived here only a short time ago. I have been here since last Friday.
Begin
Begun
I was late. The teacher ___ (give, already) a quiz when I got to class.
I was late. The teacher had already given a quiz when I got to class.
How long you been living here? I have been here for almost two years.
How long have you been living here? I have been here for almost two years.
Fall
Fallen
Fight
Fought
I ____ (give up) smoking last year.
I gave up smoking last year.
Millions of years ago, dinosaurs walked the earth, but they ___ (become) extinct by the time people first appeared.
Millions of years ago, dinosaurs walked the earth, but they had become extinct by the time people first appeared.
Sell
Sold