Also, I am returning to normal useage words such as "hast," "art," "hath," and so on, because they go with thou/etc.
Thus, in thy everyday speech, thou shouldst speak to thy fellow human using "you/r(s)" ONLY WHEN BEING FORMAL! In thy informal speech, thou shouldst returnest to thy "thou"s.
To better use thy "thou"s, here are some basics where thouing is concerned:
A. If confused about which word to use, think first how you would say the sentence in the singular, then go by this:
1. "Thou" corresponds to "I."
2. "Thee" corresponds to "me."
3. "Thy" corresponds to "my."
4. "Thine" corresponds to "mine."
B. Remember, words immediately affected by "th(ou/ee/y/ine)" must have "est" or "st" suffixes added to them.
Examples: "Sir, thy car's headlights are still on."
"Ma'am, I believe this purse is thine."
"Thou knowest me not if thou thinkest me a coward!"
Prithee have a good day, and remember to thou! Also, find a time and place to use the following sentence: "Fie thee for a rennish knave, sirrah!"
(Originally, thou was simply the singular counterpart to the plural pronoun ye, derived from an ancient Indo-European root. In imitation of continental practice, thou was later used to express intimacy, familiarity, or even disrespect while another pronoun, you, the oblique/objective form of ye, was used for formal circumstances (see T-V distinction). After thou fell out of fashion, it was primarily retained in fixed ritual settings, so that for some speakers, it came to connote solemnity or even formality.)