помогите правильно поставить артикль а/an в словосочетаниях playing boy.running sportsman.opened book.singing girl.flying bird.built house.eaten breakfast.sent lette.falling chair.decorates room.
a playing boy
a running sportsman
an opened book
a singing girl
a flying bird
a built house
an eaten breakfast
a sent letter
a falling chair
a decorated room
a, a, an, a, a, a, an, a, a, a