I had the opinion that "have to" can be used in the simple present to refer to a pesent obligation until I came across this sentence.
I'm having to bone up on criminal law for a test next week. (Longman)
Well, what would the difference be if I said
I have to bone up on criminal law for a test next week.
My non-native intuition tells me that in the first one I started studying, but in the second one not yet. Is my intuition playing tricks on me? ![Smile [:)]](/emoticons/emotion-1.gif)