зат есімнің  алдынан тиісті белгісіздік артикль қойыңыз:   pen ,  desk, armchair, pencil, chair, wall, window, bedroom, bathroom,car, flat, house, carpet, sofa, floor, clock, cup, room, corner.

a pen ,  a desk, an armchair, a pencil, a chair, a wall, a window, a bedroom, a bathroom,a car, a flat, a house, a carpet, a sofa, a floor, a clock, a cup, a room, a corner.