It’s been a long time since I’ve had cheesecake.
It's been raining non-stop for three days.
- It has been raining nonstop for three days.
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.
... this convergence of cultures has shaped the city and contributed to its ...
... while everybody else's has gone up. ...