Can I use word "Thou", "Thee", "Thy" and "Thine" like following
In a comment, Janus Bahs Jacquet wrote:
Thou requires a specific form of the verb, which always ends in -((e)s)t (e.g., thou art, thou wert, thou canst, thou thinkest, etc.), so the first sentence is not grammatical. The rest are fine. Since they are so archaic, however, you should be aware that it’s frequently not just a matter of substituting one word for another – in order for it to seem natural, you’d have to emulate other grammatical features of older English as well, such as different vocabulary and inversion instead of do-support in questions (“Camest thou yestereve?” instead of “Did you come last night?”).