could vouch
Regular verb: vouch - vouched- vouched

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could vouch
you could vouch
she could vouch
we could vouch
you could vouch
they could vouch 	I could be vouching
you could be vouching
she could be vouching
we could be vouching
you could be vouching
they could be vouching	I could have vouched
you could have vouched
she could have vouched
we could have vouched
you could have vouched
they could have vouched	I could have been vouching
you could have been vouching
she could have been vouching
we could have been vouching
you could have been vouching
they could have been vouching	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not vouch
you could not vouch
she could not vouch
we could not vouch
you could not vouch
they could not vouch 	I could not be vouching
you could not be vouching
she could not be vouching
we could not be vouching
you could not be vouching
they could not be vouching	I could not have vouched
you could not have vouched
she could not have vouched
we could not have vouched
you could not have vouched
they could not have vouched	I could not have been vouching
you could not have been vouching
she could not have been vouching
we could not have been vouching
you could not have been vouching
they could not have been vouching	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I vouch?
could you vouch?
could she vouch?
could we vouch?
could you vouch?
could they vouch? 	could I be vouching?
could you be vouching?
could she be vouching?
could we be vouching?
could you be vouching?
could they be vouching? 	could I have vouched?
could you have vouched?
could she have vouched?
could we have vouched?
could you have vouched?
could they have vouched? 	could I have been vouching?
could you have been vouching?
could she have been vouching?
could we have been vouching?
could you have been vouching?
could they have been vouching? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not vouch?
could you not vouch?
could she not vouch?
could we not vouch?
could you not vouch?
could they not vouch? 	could I not be vouching?
could you not be vouching?
could she not be vouching?
could we not be vouching?
could you not be vouching?
could they not be vouching? 	could I not have vouched?
could you not have vouched?
could she not have vouched?
could we not have vouched?
could you not have vouched?
could they not have vouched? 	could I not have been vouching?
could you not have been vouching?
could she not have been vouching?
could we not have been vouching?
could you not have been vouching?
could they not have been vouching?