Помогите пожалуйста в следующих предложениях измените время глагола на Present Perfect время глагола на Present Perfect. Спасибо заранее
The children are putting on their coats. The pupils are writing a dictation. . She is telling them an interesting story.The waiter is putting a bottle of lemonade in front of him.

The children have put on their coats. The pupils have written a dictation. She has told them an interesting story. The waiter has put a bottle of lemonade in front of him.