could perpetuate
Regular verb: perpetuate - perpetuated- perpetuated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could perpetuate
you could perpetuate
she could perpetuate
we could perpetuate
you could perpetuate
they could perpetuate 	I could be perpetuating
you could be perpetuating
she could be perpetuating
we could be perpetuating
you could be perpetuating
they could be perpetuating	I could have perpetuated
you could have perpetuated
she could have perpetuated
we could have perpetuated
you could have perpetuated
they could have perpetuated	I could have been perpetuating
you could have been perpetuating
she could have been perpetuating
we could have been perpetuating
you could have been perpetuating
they could have been perpetuating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't perpetuate
you couldn't perpetuate
she couldn't perpetuate
we couldn't perpetuate
you couldn't perpetuate
they couldn't perpetuate 	I couldn't be perpetuating
you couldn't be perpetuating
she couldn't be perpetuating
we couldn't be perpetuating
you couldn't be perpetuating
they couldn't be perpetuating	I couldn't have perpetuated
you couldn't have perpetuated
she couldn't have perpetuated
we couldn't have perpetuated
you couldn't have perpetuated
they couldn't have perpetuated	I couldn't have been perpetuating
you couldn't have been perpetuating
she couldn't have been perpetuating
we couldn't have been perpetuating
you couldn't have been perpetuating
they couldn't have been perpetuating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I perpetuate?
could you perpetuate?
could she perpetuate?
could we perpetuate?
could you perpetuate?
could they perpetuate? 	could I be perpetuating?
could you be perpetuating?
could she be perpetuating?
could we be perpetuating?
could you be perpetuating?
could they be perpetuating? 	could I have perpetuated?
could you have perpetuated?
could she have perpetuated?
could we have perpetuated?
could you have perpetuated?
could they have perpetuated? 	could I have been perpetuating?
could you have been perpetuating?
could she have been perpetuating?
could we have been perpetuating?
could you have been perpetuating?
could they have been perpetuating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I perpetuate?
couldn't you perpetuate?
couldn't she perpetuate?
couldn't we perpetuate?
couldn't you perpetuate?
couldn't they perpetuate? 	couldn't I be perpetuating?
couldn't you be perpetuating?
couldn't she be perpetuating?
couldn't we be perpetuating?
couldn't you be perpetuating?
couldn't they be perpetuating? 	couldn't I have perpetuated?
couldn't you have perpetuated?
couldn't she have perpetuated?
couldn't we have perpetuated?
couldn't you have perpetuated?
couldn't they have perpetuated? 	couldn't I have been perpetuating?
couldn't you have been perpetuating?
couldn't she have been perpetuating?
couldn't we have been perpetuating?
couldn't you have been perpetuating?
couldn't they have been perpetuating?