Look at the time! We (talk) for hours!
Look at the time! We have been talking for hours!
Americans (have) Thanksgiving dinners for hundreds years.
Americans have been having Thanksgiving dinners for hundreds years.
I can't afford this dress. I (spend) all my money.
I can't afford this dress. I have spent all my money.
Shane and Karen (go out) since summer and are really in love.
Shane and Karen have been going out since summer and are really in love.
Ben and Sharon (go out) several times but they didn't get on well.
Ben and Sharon have gone out several times but they didn't get on well.
I'm not hungry. I (have) my dinner.
I'm not hungry. I've had my dinner.
We (spend) too much recently. We should save more.
We have been spending too much recently. We should save more.
I don't know Tom well, but we (talk) on the phone once or twice.
I don't know Tom well, but we've talked on the phone once or twice.