1 how long ........do you waiting.................for me (you wait)
2what........has John been doing...........since he returned/(john/do)
3why.......have you not been eating.......meat lately?(you/not eat)
4 there,so much snow on the road ..Has it been snowing.....all night ? (it/snow)
 

1 have you waited 
2 has John done 
3 haven't you eaten
4 Has it snowed