could avenge
Regular verb: avenge - avenged- avenged

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could avenge
you could avenge
she could avenge
we could avenge
you could avenge
they could avenge 	I could be avenging
you could be avenging
she could be avenging
we could be avenging
you could be avenging
they could be avenging	I could have avenged
you could have avenged
she could have avenged
we could have avenged
you could have avenged
they could have avenged	I could have been avenging
you could have been avenging
she could have been avenging
we could have been avenging
you could have been avenging
they could have been avenging	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't avenge
you couldn't avenge
she couldn't avenge
we couldn't avenge
you couldn't avenge
they couldn't avenge 	I couldn't be avenging
you couldn't be avenging
she couldn't be avenging
we couldn't be avenging
you couldn't be avenging
they couldn't be avenging	I couldn't have avenged
you couldn't have avenged
she couldn't have avenged
we couldn't have avenged
you couldn't have avenged
they couldn't have avenged	I couldn't have been avenging
you couldn't have been avenging
she couldn't have been avenging
we couldn't have been avenging
you couldn't have been avenging
they couldn't have been avenging	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I avenge?
could you avenge?
could she avenge?
could we avenge?
could you avenge?
could they avenge? 	could I be avenging?
could you be avenging?
could she be avenging?
could we be avenging?
could you be avenging?
could they be avenging? 	could I have avenged?
could you have avenged?
could she have avenged?
could we have avenged?
could you have avenged?
could they have avenged? 	could I have been avenging?
could you have been avenging?
could she have been avenging?
could we have been avenging?
could you have been avenging?
could they have been avenging? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I avenge?
couldn't you avenge?
couldn't she avenge?
couldn't we avenge?
couldn't you avenge?
couldn't they avenge? 	couldn't I be avenging?
couldn't you be avenging?
couldn't she be avenging?
couldn't we be avenging?
couldn't you be avenging?
couldn't they be avenging? 	couldn't I have avenged?
couldn't you have avenged?
couldn't she have avenged?
couldn't we have avenged?
couldn't you have avenged?
couldn't they have avenged? 	couldn't I have been avenging?
couldn't you have been avenging?
couldn't she have been avenging?
couldn't we have been avenging?
couldn't you have been avenging?
couldn't they have been avenging?