给定一个英文句子，输出其中最常出现的五个单词以及它们在句子中的位置。


This is a simple test case to find the most common words in a sentence.
The, a, in, to, and are the most common words in the given sentence. 

Their positions in the sentence are:
- The: 1
- a: 3
- in: 13
- to: 7
- and: 11