给定一段英文文本，请计算其中每个单词出现的次数。


“Hello, my name is John. I have a dog named Duke. Duke is a good dog, and he loves to play fetch."
Hello: 1, my: 1, name: 1, is: 1, John: 1, I: 1, have: 1, a: 1, dog: 2, named: 1, Duke: 2, good: 1, and: 1, he: 1, loves: 1, to: 1, play: 1, fetch: 1.