Quote:
Originally Posted by kennyc
Nope, you need a direct object if 'grates" is a verb. .... of course I'm no Ronald Regan, nor do I play one on the internet...
I suppose in isolation if "this" does not refer to the previous sentence they yeah it could be construed to be a complete sentence, say if I were holding a cheese grader and said it.

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you GRATE cheese not GRADE it!

it's not a road surface (well maybe for mice)