The Tower has stood in this location since 1350.
I have been standing in line to get into the Tower since 10:00 a.m.
Have you ever visited Pisa?
I've never visited Pisa.
I haven't ever visited Pisa.
You haven't ever been to Pisa?
Yes, I haven't.
Engineers have tried to keep the Tower of Pisa from falling.
They have been trying a new method.
The committee has recently made a Quicktime VR from the top of the tower.
The bus has already been here. (It came early and left.)
The bus hasn't come yet. (It's late and I am still waiting.)
I spilled my drink on the carpet. I cleaned it up afterwards. (Done. Finished. I'm not thinking about it anymore.)
You have spilled your drink on the carpet. (Because the spill remains, it is on my mind.)
Mary Morris applied for her passport last month because she will soon be leaving on a trip that she _____ about for many years.
"When the tower was closed to the public a decade ago, officials said it would be open again in just a few years. The ambitious plan to stop the tower's increasing tilt has taken far longer than expected, but officials say it is succeeding."
We have been coming to this beach for fifteen years.
We have been coming to this beach since July, 1995.
Jamie (let) _____the ball drop in yesterday's final play.
Where did you get those jeans?
Where have you been (for the past few hours)?
Wow! He did a backflip!
He has done lots of backflips in his career.