1.You see the light is on . But there is nobody in the room.
A : Look! The light is on.
B : I know and I don't want to turn it on again in half an hour.
A :..............................................................
B : Oh , I see . Thank you.
2.You see the water running while your friend is brushing his/her teeth.
A :..............................................................
B : I know but I often do it because it's more convenient for me.
A :..................................................................
3.You see your friend throw pieces of paper in the classroom.
A :..............................................................
B : I think there will be a cleaner to pick them up.
A :..............................................................
B : Ok . I'll pick them up now.
4.You see your friend use so many plastic bags.
A :..............................................................
B : I know but plastic bags are convenient to use.
A :..............................................................
B : I understand now . I'll use fewer bags . Thank you.
