This form is no longer used in modern English, but it was common in older forms of the language.
Here are some examples of how "thou" was used:
* Thou art my friend. (You are my friend)
* Thou shalt not kill. (You shall not kill)
* Wilt thou have this man to be thy lawful wedded husband? (Will you have this man to be your lawful wedded husband?)
Note: "Thou" was used in a more informal and familiar context, while "you" was used for more formal or respectful addresses.