could drivel
Regular verb: drivel - drivelled- drivelled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could drivel
you could drivel
he could drivel
we could drivel
you could drivel
they could drivel 	I could be drivelling
you could be drivelling
he could be drivelling
we could be drivelling
you could be drivelling
they could be drivelling	I could have drivelled
you could have drivelled
he could have drivelled
we could have drivelled
you could have drivelled
they could have drivelled	I could have been drivelling
you could have been drivelling
he could have been drivelling
we could have been drivelling
you could have been drivelling
they could have been drivelling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't drivel
you couldn't drivel
he couldn't drivel
we couldn't drivel
you couldn't drivel
they couldn't drivel 	I couldn't be drivelling
you couldn't be drivelling
he couldn't be drivelling
we couldn't be drivelling
you couldn't be drivelling
they couldn't be drivelling	I couldn't have drivelled
you couldn't have drivelled
he couldn't have drivelled
we couldn't have drivelled
you couldn't have drivelled
they couldn't have drivelled	I couldn't have been drivelling
you couldn't have been drivelling
he couldn't have been drivelling
we couldn't have been drivelling
you couldn't have been drivelling
they couldn't have been drivelling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I drivel?
could you drivel?
could he drivel?
could we drivel?
could you drivel?
could they drivel? 	could I be drivelling?
could you be drivelling?
could he be drivelling?
could we be drivelling?
could you be drivelling?
could they be drivelling? 	could I have drivelled?
could you have drivelled?
could he have drivelled?
could we have drivelled?
could you have drivelled?
could they have drivelled? 	could I have been drivelling?
could you have been drivelling?
could he have been drivelling?
could we have been drivelling?
could you have been drivelling?
could they have been drivelling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I drivel?
couldn't you drivel?
couldn't he drivel?
couldn't we drivel?
couldn't you drivel?
couldn't they drivel? 	couldn't I be drivelling?
couldn't you be drivelling?
couldn't he be drivelling?
couldn't we be drivelling?
couldn't you be drivelling?
couldn't they be drivelling? 	couldn't I have drivelled?
couldn't you have drivelled?
couldn't he have drivelled?
couldn't we have drivelled?
couldn't you have drivelled?
couldn't they have drivelled? 	couldn't I have been drivelling?
couldn't you have been drivelling?
couldn't he have been drivelling?
couldn't we have been drivelling?
couldn't you have been drivelling?
couldn't they have been drivelling?