Verbless sentence



I thought I heard my teacher said: 'Don't construct a sentence without a verb.'


Is there such rule in english grammar?


She looks like 70 years old. Perhaps older.

How about the question above? Is it correct? Is there any book that can be used references for wide range of topics in grammar(including syntax, morphology et cetera)? I have finished oxford grammar in use recently and think it wasn't enough for me.




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