Нужно вставить частичку "не так ли":
1.the pupils are seldom late,
2.we can sing english songs,
3.they never play on the floor,
4.there is no bookcase near the wall,
5.there were plants in that classroom last year,
6.pupils dont often laugh at maths,
7.we shall study art next year,
и перевод желательно.
1)aren't they 2)can't we 3)are they 4)is it 5)weren't they 6) do they 7)shall not we