A или an: cep, plasticine, paintbrush, chalk, crayon, ink, feltpen, marker, compasses (в мн. ч), alidad, puncher, pencil

A: a cep, a plasticine, a paintbrush, a chalk, a crayon, a feltpen, a marker, a puncher, a pencil pot, a glue, a gluestick, a sticker, a scotch tape, a stapler, a staple remover, a correction fluid, a correction tape, a drawing pin, a magnet, a calculator, a desk organizer, a map, a globe, a spike, a record book, a colouring book, a folder, a whiteboard.An: an ink, an alidad, an atlas, an encyclopedia.Артикль не ставится: сompasses, scissors, paper clips.