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's the book I've been looking for.
If that's false, she's a liar.
- If that is not true, she is a liar.
That's a useful piece of information.
- That is a useful piece of information.
... appreciate just how much we know, how much humanity has ...
... has posted a picture of Paris, and ...