could regenerate
Regular verb: regenerate - regenerated- regenerated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could regenerate
you could regenerate
he could regenerate
we could regenerate
you could regenerate
they could regenerate 	I could be regenerating
you could be regenerating
he could be regenerating
we could be regenerating
you could be regenerating
they could be regenerating	I could have regenerated
you could have regenerated
he could have regenerated
we could have regenerated
you could have regenerated
they could have regenerated	I could have been regenerating
you could have been regenerating
he could have been regenerating
we could have been regenerating
you could have been regenerating
they could have been regenerating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't regenerate
you couldn't regenerate
he couldn't regenerate
we couldn't regenerate
you couldn't regenerate
they couldn't regenerate 	I couldn't be regenerating
you couldn't be regenerating
he couldn't be regenerating
we couldn't be regenerating
you couldn't be regenerating
they couldn't be regenerating	I couldn't have regenerated
you couldn't have regenerated
he couldn't have regenerated
we couldn't have regenerated
you couldn't have regenerated
they couldn't have regenerated	I couldn't have been regenerating
you couldn't have been regenerating
he couldn't have been regenerating
we couldn't have been regenerating
you couldn't have been regenerating
they couldn't have been regenerating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I regenerate?
could you regenerate?
could he regenerate?
could we regenerate?
could you regenerate?
could they regenerate? 	could I be regenerating?
could you be regenerating?
could he be regenerating?
could we be regenerating?
could you be regenerating?
could they be regenerating? 	could I have regenerated?
could you have regenerated?
could he have regenerated?
could we have regenerated?
could you have regenerated?
could they have regenerated? 	could I have been regenerating?
could you have been regenerating?
could he have been regenerating?
could we have been regenerating?
could you have been regenerating?
could they have been regenerating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I regenerate?
couldn't you regenerate?
couldn't he regenerate?
couldn't we regenerate?
couldn't you regenerate?
couldn't they regenerate? 	couldn't I be regenerating?
couldn't you be regenerating?
couldn't he be regenerating?
couldn't we be regenerating?
couldn't you be regenerating?
couldn't they be regenerating? 	couldn't I have regenerated?
couldn't you have regenerated?
couldn't he have regenerated?
couldn't we have regenerated?
couldn't you have regenerated?
couldn't they have regenerated? 	couldn't I have been regenerating?
couldn't you have been regenerating?
couldn't he have been regenerating?
couldn't we have been regenerating?
couldn't you have been regenerating?
couldn't they have been regenerating?