"Thou" is roughly equivalent to "I." Anywhere you would say "I" in a first-person sentence is where you would say "thou" in a second-person sentence. And anywhere you would say "me" in first-person, you would say "thee" in second-person.
A. "I really love chocolate."
B. "Thou dost really love chocolate."
A. "Give me chocolate and nobody gets hurt!"
B. "I shall give thee chocolate so nobody dost get hurt."
A. "Who stole the chocolate cake, you ask? Twas I."
B. "I know who stole the chocolate cake. Twas thou!"
A. "I want to know who ate my chocolate cheesecake. It was MINE!"
B. "Thou wantest to know who ate thy chocolate cheesecake. Understandable. For twas, after all, thine."
A. "Tell me who stole my cheesecake so I can beat them up."
B. "As soon as I know the culprit, I shall tell thee who stole thy cheesecake."
A. "I am now going to prison for murder. Write me!"
B. "Thou art surprised at being imprisoned? Well, I shall write thee anyway."
More useful stuff:
S/he (general) doth
"Do that and no one doth get hurt."
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