could proliferate
Regular verb: proliferate - proliferated- proliferated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could proliferate
you could proliferate
he could proliferate
we could proliferate
you could proliferate
they could proliferate 	I could be proliferating
you could be proliferating
he could be proliferating
we could be proliferating
you could be proliferating
they could be proliferating	I could have proliferated
you could have proliferated
he could have proliferated
we could have proliferated
you could have proliferated
they could have proliferated	I could have been proliferating
you could have been proliferating
he could have been proliferating
we could have been proliferating
you could have been proliferating
they could have been proliferating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't proliferate
you couldn't proliferate
he couldn't proliferate
we couldn't proliferate
you couldn't proliferate
they couldn't proliferate 	I couldn't be proliferating
you couldn't be proliferating
he couldn't be proliferating
we couldn't be proliferating
you couldn't be proliferating
they couldn't be proliferating	I couldn't have proliferated
you couldn't have proliferated
he couldn't have proliferated
we couldn't have proliferated
you couldn't have proliferated
they couldn't have proliferated	I couldn't have been proliferating
you couldn't have been proliferating
he couldn't have been proliferating
we couldn't have been proliferating
you couldn't have been proliferating
they couldn't have been proliferating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I proliferate?
could you proliferate?
could he proliferate?
could we proliferate?
could you proliferate?
could they proliferate? 	could I be proliferating?
could you be proliferating?
could he be proliferating?
could we be proliferating?
could you be proliferating?
could they be proliferating? 	could I have proliferated?
could you have proliferated?
could he have proliferated?
could we have proliferated?
could you have proliferated?
could they have proliferated? 	could I have been proliferating?
could you have been proliferating?
could he have been proliferating?
could we have been proliferating?
could you have been proliferating?
could they have been proliferating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I proliferate?
couldn't you proliferate?
couldn't he proliferate?
couldn't we proliferate?
couldn't you proliferate?
couldn't they proliferate? 	couldn't I be proliferating?
couldn't you be proliferating?
couldn't he be proliferating?
couldn't we be proliferating?
couldn't you be proliferating?
couldn't they be proliferating? 	couldn't I have proliferated?
couldn't you have proliferated?
couldn't he have proliferated?
couldn't we have proliferated?
couldn't you have proliferated?
couldn't they have proliferated? 	couldn't I have been proliferating?
couldn't you have been proliferating?
couldn't he have been proliferating?
couldn't we have been proliferating?
couldn't you have been proliferating?
couldn't they have been proliferating?