SO and SUCH
My bed is so comfortable that I could lay on it all day.
I have such a comfortable sofa that I could lay on it all day.
I'm reading so interesting book that I can't stop it.
I'm reading such an interesting book that I can't stop it.
It's such an easy task to do that's why I think I'll finish it immediately.
The task is so easy to do that's why I think I'll finish it immediately.