Надо изменить время глагола на Present Perfect,
pupils are writing a dictation
is helping me to solve a difficult problem
learning a poem
manners are going out of fashion
watching the news
waiter is putting a bottle of lemonade in front of him.
eating my breakfast
bringing them some meat and vegetables.
putting the dishes on the table .
taking the dirty plates from the table
children are putting on their coats
making a new dress for her birthday party
opening a box of chocolates .
buying milk for milk shakes
ordering a bottle of apple juice