My son is full out in the midst of his terrible twos. However, my daughter didn't go through that phase at all until she was 4! I refer to them as the F%&#ing Fours LOL. She suddenly became very resistant and i foudn the best strategy was to stay incredibly god-like calm, remove her from the situation to the staircase and say "When you are ready to use your words and talk to me, you may come off the stairs". Then I would turn around and continue on with whatever I was doing. Sometimes it took longer than others, but I used the same approach every single time and it eventually stopped. When she was ready to talk I would use language like "I could see that you were very upset, can you use your words to tell me why you were upset?" "When we get upset we need to talk in a big girl voice and use our words. It is not ok to scream. Thank you for calming down and talking to me nicely"