Buatlah dialog 4 orang the expression of attention dan the expression of understanding? fast gan

mr. budi: class! please pay attention to my explanation
students: yes, sir
mr. budi: put up your hand if you dont understand. doyou understand?
students: yes, we do sir
mr. budi: tom, will you do number 5 on the board?
tom: sure, i will try
mr. budi: everybody, look at the board and pay attention. bob, is it clear?
bob: yes, it is , sir