-Neither refers to two people,things or groups and has a negative meaning.It is followed by a singular countable noun.However the Neither of+plural noun phrase structure can by followed by either a singular or plural verb in the affirmative. Neither shop had the CD I was looking for. Neither of them has/have been to paris before.
-All refers to more than two people,things or groups. It has a positive meaning and is followed by a plural verb.all of the rooms have en suite bathrooms and air conditioning.