Use the phrases: sorry,you are not right.in my opinion; i don't agree with you ; i'm sure model: -he didn't make this experiment. -sorry,you are not right.he made it last friday. -i'm sure 1)mary did not go to see her friend(yesterday) 2)she didn't pass her entrance exams in chemistry (last session) 3)ann didn't read the article(2 days ago) 4)the group didn't get any good marks at the exam(last time) 5)the monitor didn't give her the list of books(last week)