When you see a very big cake on the table just in front of you, which, #1 or #2, below, would you be likely to say? 1. What a big cake this is! 2. How big this cake is! A friend insists that #2 is not natural. I feel #1 and #2 are both grammatical and natural English. Grammar books at hand give these two types of exclamatory sentence: “what a ‘noun’” pattern and “how ‘adjective’” pattern. I’d appreciate it if you would give any comment.