Not to mention is an Idiom: meaning Much less - used as an adverb to add emphasis to what you are saying
The boy hasn't learnt arithmetic, not to mention algebra.( Here you want to emphasize that the boy is poor in all ereas of mathematics,not to mention algebra is an adverbial phrase )
she can't boil potatoes, not to mention cooking a meal. (To emphasize that she does not know ABC of cooking, the under lined portion is an adverbial phrase)
she can't boil potatoes, not to mention cooking a meal. (To emphasize that she does not know ABC of cooking, the under lined portion is an adverbial phrase)
In that case, can we assume that the phrase following the 'not to mention' is harder, more difficult or has a higher degree than the phrase before the idiom?
In that case, can we assume that the phrase following the 'not to mention' is harder, more difficult or has a higher degree than the phrase before the idiom?