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 raining non-stop for three days.
- It has been raining nonstop for three days.
I've managed to find the solution to the problem that's been bugging me all day.
This is the best thing that's ever happened to me.
- This is the best thing that has ever happened to me.
You're the best thing that's ever happened to me.
- You are the best thing that has ever happened to me!
... That could be because that particular computer has ...
... Now think about what has happened in China, in India, in other parts of the world. Growth ...