It’s been a long time since I’ve had cheesecake.
It's been three years since Bob started his own business.
- It has been three years since Bob started his own business.
It's been a good day.
- It has been a good day.
I've managed to find the solution to the problem that's been bugging me all day.
You're the best thing that's ever happened to me.
- You are the best thing that has ever happened to me!
This is the best thing that's ever happened to me.
- This is the best thing that has ever happened to me.
... it on the internet, everybody else on the internet has the secret, too. ...
... Now it has been quite a long morning, an exciting morning. ...