The only thing I'm certain about regarding contraction is that english teachers dislike 'em in my experience. I do believe, though, that it is basically asking if someone thinks otherwise, but I will agree it does not slide off the tongue like its contraction.
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english teachers dislike 'emFor formal writing, perhaps. But if your teacher won't tolerate them under any circumstances, maybe you need to get a new teacher!
Emma wondered if it was correct grammar to say, "Isn't she pretty?" because it would sound strange if you said, "Is not she pretty?"Yes. It is perfectly grammatical.
CalifJimDoes she also think that languages change over the centuries because too many people have wax in their ears?