How to go over the text file to get all (two) from file?PLZ

How can I get every Token (word) and PreviousToken(Previous word) From text file
For example if the text file content is
"Every man has a price. Every woman has a price."

First Token(word) is "Every" PreviousToken(Previous word) is none(no previos)
Second Token(word) is "man" PreviousToken(Previous word) is "Every"
Third Token(word) is "has" PreviousToken(Previous word) is "man"
and so on..

how to go over the text file sequantioly to get all (two) words from file

like in example to get "Every man" then get "man has" then "has a" then "a price"
and so on

please I need help