could adumbrate
Regular verb: adumbrate - adumbrated- adumbrated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could adumbrate
you could adumbrate
she could adumbrate
we could adumbrate
you could adumbrate
they could adumbrate 	I could be adumbrating
you could be adumbrating
she could be adumbrating
we could be adumbrating
you could be adumbrating
they could be adumbrating	I could have adumbrated
you could have adumbrated
she could have adumbrated
we could have adumbrated
you could have adumbrated
they could have adumbrated	I could have been adumbrating
you could have been adumbrating
she could have been adumbrating
we could have been adumbrating
you could have been adumbrating
they could have been adumbrating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't adumbrate
you couldn't adumbrate
she couldn't adumbrate
we couldn't adumbrate
you couldn't adumbrate
they couldn't adumbrate 	I couldn't be adumbrating
you couldn't be adumbrating
she couldn't be adumbrating
we couldn't be adumbrating
you couldn't be adumbrating
they couldn't be adumbrating	I couldn't have adumbrated
you couldn't have adumbrated
she couldn't have adumbrated
we couldn't have adumbrated
you couldn't have adumbrated
they couldn't have adumbrated	I couldn't have been adumbrating
you couldn't have been adumbrating
she couldn't have been adumbrating
we couldn't have been adumbrating
you couldn't have been adumbrating
they couldn't have been adumbrating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I adumbrate?
could you adumbrate?
could she adumbrate?
could we adumbrate?
could you adumbrate?
could they adumbrate? 	could I be adumbrating?
could you be adumbrating?
could she be adumbrating?
could we be adumbrating?
could you be adumbrating?
could they be adumbrating? 	could I have adumbrated?
could you have adumbrated?
could she have adumbrated?
could we have adumbrated?
could you have adumbrated?
could they have adumbrated? 	could I have been adumbrating?
could you have been adumbrating?
could she have been adumbrating?
could we have been adumbrating?
could you have been adumbrating?
could they have been adumbrating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I adumbrate?
couldn't you adumbrate?
couldn't she adumbrate?
couldn't we adumbrate?
couldn't you adumbrate?
couldn't they adumbrate? 	couldn't I be adumbrating?
couldn't you be adumbrating?
couldn't she be adumbrating?
couldn't we be adumbrating?
couldn't you be adumbrating?
couldn't they be adumbrating? 	couldn't I have adumbrated?
couldn't you have adumbrated?
couldn't she have adumbrated?
couldn't we have adumbrated?
couldn't you have adumbrated?
couldn't they have adumbrated? 	couldn't I have been adumbrating?
couldn't you have been adumbrating?
couldn't she have been adumbrating?
couldn't we have been adumbrating?
couldn't you have been adumbrating?
couldn't they have been adumbrating?