could acerbate
Regular verb: acerbate - acerbated- acerbated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could acerbate
you could acerbate
she could acerbate
we could acerbate
you could acerbate
they could acerbate 	I could be acerbating
you could be acerbating
she could be acerbating
we could be acerbating
you could be acerbating
they could be acerbating	I could have acerbated
you could have acerbated
she could have acerbated
we could have acerbated
you could have acerbated
they could have acerbated	I could have been acerbating
you could have been acerbating
she could have been acerbating
we could have been acerbating
you could have been acerbating
they could have been acerbating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't acerbate
you couldn't acerbate
she couldn't acerbate
we couldn't acerbate
you couldn't acerbate
they couldn't acerbate 	I couldn't be acerbating
you couldn't be acerbating
she couldn't be acerbating
we couldn't be acerbating
you couldn't be acerbating
they couldn't be acerbating	I couldn't have acerbated
you couldn't have acerbated
she couldn't have acerbated
we couldn't have acerbated
you couldn't have acerbated
they couldn't have acerbated	I couldn't have been acerbating
you couldn't have been acerbating
she couldn't have been acerbating
we couldn't have been acerbating
you couldn't have been acerbating
they couldn't have been acerbating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I acerbate?
could you acerbate?
could she acerbate?
could we acerbate?
could you acerbate?
could they acerbate? 	could I be acerbating?
could you be acerbating?
could she be acerbating?
could we be acerbating?
could you be acerbating?
could they be acerbating? 	could I have acerbated?
could you have acerbated?
could she have acerbated?
could we have acerbated?
could you have acerbated?
could they have acerbated? 	could I have been acerbating?
could you have been acerbating?
could she have been acerbating?
could we have been acerbating?
could you have been acerbating?
could they have been acerbating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I acerbate?
couldn't you acerbate?
couldn't she acerbate?
couldn't we acerbate?
couldn't you acerbate?
couldn't they acerbate? 	couldn't I be acerbating?
couldn't you be acerbating?
couldn't she be acerbating?
couldn't we be acerbating?
couldn't you be acerbating?
couldn't they be acerbating? 	couldn't I have acerbated?
couldn't you have acerbated?
couldn't she have acerbated?
couldn't we have acerbated?
couldn't you have acerbated?
couldn't they have acerbated? 	couldn't I have been acerbating?
couldn't you have been acerbating?
couldn't she have been acerbating?
couldn't we have been acerbating?
couldn't you have been acerbating?
couldn't they have been acerbating?