Can I say : I'm cooking since this morning or I have been cooking for two hours?
Hello,
I wonder how I can say this sentence correctly
For example If it's noon and I want to tell someone how long I cooked for a lunch.
I have been cooking for two hours?
I'm cooking since this morning?

Are these correct?
Thank you so much :)

Question

Can I say : I'm cooking since this morning or I have been cooking for two hours?
Hello,
I wonder how I can say this sentence correctly
For example If it's noon and I want to tell someone how long I cooked for a lunch. 
I have been cooking for two hours?
I'm cooking since this morning?

Are these correct?   
Thank you so much :)

Answer

I have been cooking for two hours or I've been cooking all morning would both work very well.

Answer

You could use 'since this morning', but if it's only 12:05 it could mean five minutes or five hours.  If it was evening however it works great.

'Since two hours' is incorrect, it would be FOR two hours.  'Since' would be used if you mention a time or a reference of a time; so 'since 9am' or 'since breakfast', which implies a time.

Hope that helps

Answer

it's  noon

1)   I've been  cooking  for  2 hours              
2)   I've been  cooking since 10 o clock.

Answer

I would say it this way:  I cooked my lunch for two hours and now it's finished.