Mostrami frasi di esempio con what happens /what has happened /what happened /what is happening。can anybody use the above phrases to make sentences and tell me the definition when can i use the particular one .Indicami il maggior numero possibile di espressioni quotidiane.

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'what happens' is used to describe or ask about things that generally happen or that might happen.
- A: I don't need a job because my girlfriend gives me pocket money.
B: Well, what happens if she leaves you...?
- A: Sir, what happens if I forget to hand in my assignment?
B: Well, you'll automatically fail the course.
- A: Don't forget to give my book back tomorrow.
B: And what happens if I don't?
A: I'll be pissed.
- I wonder what happens to all the leftover food at restaurants.

'what has happened' (more often contracted as 'what's happened') is used to talk about a particular state/occurrence that has continued from the past. It is quite often interchangeable with 'what happened.'
- He used to be so good at basketball, what's happened to him? (Why isn't he good anymore?)
- Everyday, all I hear is bad news... What has happened to this world?

'what happened' is used to talk about something that happened in the past.
- I heard she's in hospital. What happened to her?
- What happened to John, I haven't seen him in a few weeks.
- A: I don't understand how this happened...
B: Well, what happened is that... (description of what happened).

'what is happening' is used for something that is occurring at this very moment.
- A: What's that alarm for?
B: It's a fire drill. We have to go.
A: Wait, what's happening? I'm so confused.
- What's happening at the moment in your city?