I have just eaten a breakfast.
He has just eaten a breakfast.
We haven't eaten a breakfast yet.
They are still drinking tea in canteen.
I have already done my homework.
He is still doing his homework.
We have had 3 lessons today.
They have just had a convention.
She hasn't read this book yet.
Who has written this?
What have you written him?
вроде бы, все должно быть верно