N1

1) the children have not been lying in the sun

2) the doctor has not been examining the patients

3) Jack has not been dancing the whole evening

N2

1) pollution

2) coal

3) waste

N3

1) He has been waiting for his girlfriend since 6 o'clock

2) Emily has been working on the computer for too long.

3) Mal has been listening to music since 11:00