In fact it seems also to be correct in my sons’ regional (Wiltshire, UK), social (not very posh) and generational (born between 1990 and 2000) dialects. Another usage they bring home is writ as the past, both perfect and participle, of write. I gave up correcting that one, and now quite like it.

As for thing/think, Nuscha, the latter is a common mispronunciation in the UK; i don’t know about the USA. This is one i can’t get to like! I simply hate hearing ’somethink’. Then from the pronunciation, the spelling would easily follow. I suppose it’s the same sound shift as the audible g in words like singing, which is not natural to me but normal in part of the northern UK. North-western, i think.

In church, our liturgy has traditionally used a phrase such as “Thou Who sittest at the right hand of God the Father” to refer to Jesus, singular. As we have changed over from using the King James Bible translation, we have also gradually changed from use of “thee” and “thou” and the “est” forms of the verbs in the liturgy. I believe, then, that we should be singing “You Who sit at . . .” but those in charge have written “You Who sits at . . .” It disturbs me (only slightly–I know the intended meaning regardless of the word used) every time I sing it. Am I correct or just being picky?

Knowing the history of the syntactic theories is part of the fun.

Thank you for helping me realize I am not the only Grammar Police out there

A few verbs have irregular thou forms:
to be: thou art (or thou beest), thou wast (or thou wert; originally thou were)