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Tony Walton: Go to 'Tools' on your computer, then click on 'Spelling & Grammar'. You will find that my sentence "Correct spelling and grammar is essential" - is correct. You can conflate 'spelling and grammar' in such a sentence as they are singular words, whereas you cannot, as you so humorously declare (and I am still laughing): "Cows and sheep is farm animals" simply because cows and sheep are plural words. But never mind, you live and learn.Signe, 13 years ago.