1.Our classmate are having fun / enjoying themselves on the Great Wall.
注：(have a good time = have fun = enjoy oneself 玩得开心,过得愉快） 2.Lily often sends emails to me .注：send sb sth = send sth to sb 发某物给某人
3.What are you doing on the playground
4.He doesn't often do his homework at seven o‘clock in the evening.（ 注：加助动词之后原来的动词要用原形））
5.In class,we are listening to the teacher clearly at the moment .