could deliver
Regular verb: deliver - delivered- delivered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could deliver
you could deliver
he could deliver
we could deliver
you could deliver
they could deliver 	I could be delivering
you could be delivering
he could be delivering
we could be delivering
you could be delivering
they could be delivering	I could have delivered
you could have delivered
he could have delivered
we could have delivered
you could have delivered
they could have delivered	I could have been delivering
you could have been delivering
he could have been delivering
we could have been delivering
you could have been delivering
they could have been delivering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't deliver
you couldn't deliver
he couldn't deliver
we couldn't deliver
you couldn't deliver
they couldn't deliver 	I couldn't be delivering
you couldn't be delivering
he couldn't be delivering
we couldn't be delivering
you couldn't be delivering
they couldn't be delivering	I couldn't have delivered
you couldn't have delivered
he couldn't have delivered
we couldn't have delivered
you couldn't have delivered
they couldn't have delivered	I couldn't have been delivering
you couldn't have been delivering
he couldn't have been delivering
we couldn't have been delivering
you couldn't have been delivering
they couldn't have been delivering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I deliver?
could you deliver?
could he deliver?
could we deliver?
could you deliver?
could they deliver? 	could I be delivering?
could you be delivering?
could he be delivering?
could we be delivering?
could you be delivering?
could they be delivering? 	could I have delivered?
could you have delivered?
could he have delivered?
could we have delivered?
could you have delivered?
could they have delivered? 	could I have been delivering?
could you have been delivering?
could he have been delivering?
could we have been delivering?
could you have been delivering?
could they have been delivering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I deliver?
couldn't you deliver?
couldn't he deliver?
couldn't we deliver?
couldn't you deliver?
couldn't they deliver? 	couldn't I be delivering?
couldn't you be delivering?
couldn't he be delivering?
couldn't we be delivering?
couldn't you be delivering?
couldn't they be delivering? 	couldn't I have delivered?
couldn't you have delivered?
couldn't he have delivered?
couldn't we have delivered?
couldn't you have delivered?
couldn't they have delivered? 	couldn't I have been delivering?
couldn't you have been delivering?
couldn't he have been delivering?
couldn't we have been delivering?
couldn't you have been delivering?
couldn't they have been delivering?