If your spelling and grammar are already correct, then changes will make them incorrect and should not be accepted.
Fixing spelling and grammar is one of the tasks of the WikiReviewers. See related link below.
Spelling. Grammar too.
Spelling & Proper Grammar, for one.
Practicing her spelling and grammar, you should try it sometime.
Judging from your horrible grammar and spelling, you should do all the homework you can find to do!
Punctuation and grammar
"G-R-A-M-M-A-R" (You should know, since you spelled it out in your question.)
in Microsoft word you click f3 and it should do a spelling and grammar check
Check Grammar and Spelling
with correct spelling and grammar.
That is the correct spelling of the word "believe" (accept as true).You can remember this spelling because you should never believe a lie.
Yes, you should proofread it for clarity, grammar, spelling, punctuation, etc.