Ответ: 2 задние:

1) I'm opening the door.

2) The cat is sleeping on the mat.

3) The boys are writing letters.

4) We are singing songs.

5) Thomas is making a model airplane.

3 задание:

It is raining all day.

2) I'm playing the piano now.

3) Mary coming to see us.

4) The boy is climbing the tree.

5) The baby is drinking milk.

Объяснение: