my spelling is horrid, my typos, and use of ellipis.. (or rather a sort of ellipis to indicate an incompete thought!) my tendency when excite to leave out words, all are legendary.

but somehow the hard wiring of grammer came to me intact!

the onliest word i can think of is ain't-- a word frequently used, correctly!, in my spoken idiolect. It is not the long that it has been in the dustbin, a scant 200 years or so. (our founding fathers might well have used the word!)

and unlike the school yard chant,
Ain't ain't in the dictionary,
so I ain't going to use ain't no more!
Ain't is in most dictionaries!