could adduce
Regular verb: adduce - adduced- adduced

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could adduce
you could adduce
he could adduce
we could adduce
you could adduce
they could adduce 	I could be adducing
you could be adducing
he could be adducing
we could be adducing
you could be adducing
they could be adducing	I could have adduced
you could have adduced
he could have adduced
we could have adduced
you could have adduced
they could have adduced	I could have been adducing
you could have been adducing
he could have been adducing
we could have been adducing
you could have been adducing
they could have been adducing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't adduce
you couldn't adduce
he couldn't adduce
we couldn't adduce
you couldn't adduce
they couldn't adduce 	I couldn't be adducing
you couldn't be adducing
he couldn't be adducing
we couldn't be adducing
you couldn't be adducing
they couldn't be adducing	I couldn't have adduced
you couldn't have adduced
he couldn't have adduced
we couldn't have adduced
you couldn't have adduced
they couldn't have adduced	I couldn't have been adducing
you couldn't have been adducing
he couldn't have been adducing
we couldn't have been adducing
you couldn't have been adducing
they couldn't have been adducing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I adduce?
could you adduce?
could he adduce?
could we adduce?
could you adduce?
could they adduce? 	could I be adducing?
could you be adducing?
could he be adducing?
could we be adducing?
could you be adducing?
could they be adducing? 	could I have adduced?
could you have adduced?
could he have adduced?
could we have adduced?
could you have adduced?
could they have adduced? 	could I have been adducing?
could you have been adducing?
could he have been adducing?
could we have been adducing?
could you have been adducing?
could they have been adducing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I adduce?
couldn't you adduce?
couldn't he adduce?
couldn't we adduce?
couldn't you adduce?
couldn't they adduce? 	couldn't I be adducing?
couldn't you be adducing?
couldn't he be adducing?
couldn't we be adducing?
couldn't you be adducing?
couldn't they be adducing? 	couldn't I have adduced?
couldn't you have adduced?
couldn't he have adduced?
couldn't we have adduced?
couldn't you have adduced?
couldn't they have adduced? 	couldn't I have been adducing?
couldn't you have been adducing?
couldn't he have been adducing?
couldn't we have been adducing?
couldn't you have been adducing?
couldn't they have been adducing?