Explanation - take notes!
Both ---> beide of allebei(Both girls went to the cinema) girls is plural!
Each ---> elke
(She walks to school every morning) she is singular
All ---> alle/allemaal
(They all were there this morning) plural 3 or more persons
(Every) ---> Iedere
(My favorite show starts every Thursday at 7 p.m.) plural 3 or more persons
(None) ---> Geen/niet één
(None of you were here on time!) plural 3 or more persons