(a) teacher , (a) driver ,(a) secretary - proffession but (a) brother is not
history ,maths ,literature are school subjects but (a) pencil case is a school thing
(a) helicopter ,(a) bus(a), minivan - transport but (an) elephant is an animal
(a)tiger, (a) lion, (a) monkey are animals but (a) kitchen - is a place
(an) apple,(a) peach,(an) apricot are fruts but (a) cattot is a vegetable