Gramm a r is the correct spelling. Good morning is a greeting and is not treated as a sentence. There is no tag question required.
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Anonymous What is the tag question of this sentence "good morning"?Nice morning, isn't it?
AlpheccaStarsNice morning, isn't it?We have an implicit it's a before nice morning. We don't with Good morning,
fivejedjonan implicit it's aAnd before good morning we have an implicit have a, so I suppose it's Good morning, won't you?