-ing in korean
There seems to be so many ways to say -ing in korean. It's such a headache. :)

So, let's take a simple phrase like "What are you doing?". From what i understand you can say all of the following:

뭐 해?
뭐하고 있어?
뭐하는거야?

And just to make it even more confusing there is also:
뭐하고 있는거야? - But I'm not tackling this one yet.

Now, the first two are not hard to understand. Basic present tense and present progressive. -는 것 is somewhat tricky to understand because it has multiple roles. But what i really wonder is WHEN to use them. When do you say "뭐하는거야?" instead of "뭐하고 있어?" or "뭐 해?".

And is it the same for other verbs? I'll make some sentences and then you can say if they mean the same thing.

Where are we going?
우리 어디 가?
우리 어디 가고 있어?
우리 어디가는거야?

what are you eating?
뭘 먹어?
뭘 먹고 있어?
뭘 먹는거야?

So, the question is, in what situation should they be used? And if there are any spelling/grammar errors please let me know.

Thanks in advance. ^_^

Question

-ing in korean
There seems to be so many ways to say -ing in korean. It's such a headache. :)

So, let's take a simple phrase like "What are you doing?". From what i understand you can say all of the following:

뭐 해?
뭐하고 있어?
뭐하는거야?

And just to make it even more confusing there is also:
뭐하고 있는거야? - But I'm not tackling this one yet.

Now, the first two are not hard to understand. Basic present tense and present progressive. -는 것 is somewhat tricky to understand because it has multiple roles. But what i really wonder is WHEN to use them. When do you say "뭐하는거야?" instead of "뭐하고 있어?" or "뭐 해?".

And is it the same for other verbs? I'll make some sentences and then you can say if they mean the same thing.

Where are we going?
우리 어디 가?
우리 어디 가고 있어?
우리 어디가는거야?

what are you eating?
뭘 먹어?
뭘 먹고 있어?
뭘 먹는거야?

So, the question is, in what situation should they be used? And if there are any spelling/grammar errors please let me know.

Thanks in advance. ^_^

Answer

In grammar, they are very different even they mean similar. You can read from my link precisely. :) Hope it can help you out a bit.

해? What do you do?
하고 있어? What are you doing?
하는 거야? What is the thing that you do?

http://www.coreanbigsis.com/korean-grammar-tense-usage-hae-ing-hagoisseo-hanungeoya/

Answer

뭐하는 거야 or 뭐하고 있는 거야 can sound like you're curious about what the listener's doing, or like you're annoyed with him/her doing it. You should be careful with your tone when you say either of them.

Answer

+ '뭐하는거야' is used when other person behave like bad.

Answer

All expressions are same. You can use everything. 
However,'뭐하는거야?' is sometimes used to show angry feeling with strong accent.