could perdure
Regular verb: perdure - perdured- perdured

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could perdure
you could perdure
he could perdure
we could perdure
you could perdure
they could perdure 	I could be perduring
you could be perduring
he could be perduring
we could be perduring
you could be perduring
they could be perduring	I could have perdured
you could have perdured
he could have perdured
we could have perdured
you could have perdured
they could have perdured	I could have been perduring
you could have been perduring
he could have been perduring
we could have been perduring
you could have been perduring
they could have been perduring	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't perdure
you couldn't perdure
he couldn't perdure
we couldn't perdure
you couldn't perdure
they couldn't perdure 	I couldn't be perduring
you couldn't be perduring
he couldn't be perduring
we couldn't be perduring
you couldn't be perduring
they couldn't be perduring	I couldn't have perdured
you couldn't have perdured
he couldn't have perdured
we couldn't have perdured
you couldn't have perdured
they couldn't have perdured	I couldn't have been perduring
you couldn't have been perduring
he couldn't have been perduring
we couldn't have been perduring
you couldn't have been perduring
they couldn't have been perduring	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I perdure?
could you perdure?
could he perdure?
could we perdure?
could you perdure?
could they perdure? 	could I be perduring?
could you be perduring?
could he be perduring?
could we be perduring?
could you be perduring?
could they be perduring? 	could I have perdured?
could you have perdured?
could he have perdured?
could we have perdured?
could you have perdured?
could they have perdured? 	could I have been perduring?
could you have been perduring?
could he have been perduring?
could we have been perduring?
could you have been perduring?
could they have been perduring? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I perdure?
couldn't you perdure?
couldn't he perdure?
couldn't we perdure?
couldn't you perdure?
couldn't they perdure? 	couldn't I be perduring?
couldn't you be perduring?
couldn't he be perduring?
couldn't we be perduring?
couldn't you be perduring?
couldn't they be perduring? 	couldn't I have perdured?
couldn't you have perdured?
couldn't he have perdured?
couldn't we have perdured?
couldn't you have perdured?
couldn't they have perdured? 	couldn't I have been perduring?
couldn't you have been perduring?
couldn't he have been perduring?
couldn't we have been perduring?
couldn't you have been perduring?
couldn't they have been perduring?