给定一篇英文文章，输出其中前五个最常见的单词及其出现次数。以下是一个例子：
"The quick brown fox jumps over the lazy dog. The quick brown dog jumps too."。
The 5 most common words and their frequencies in the given sentence are:
- the (4 times)
- quick (2 times)
- brown (2 times)
- jumps (2 times)
- over (1 time)