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 	
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I couldn't vouch
you couldn't vouch
she couldn't vouch
we couldn't vouch
you couldn't vouch
they couldn't vouch 	I couldn't be vouching
you couldn't be vouching
she couldn't be vouching
we couldn't be vouching
you couldn't be vouching
they couldn't be vouching	I couldn't have vouched
you couldn't have vouched
she couldn't have vouched
we couldn't have vouched
you couldn't have vouched
they couldn't have vouched	I couldn't have been vouching
you couldn't have been vouching
she couldn't have been vouching
we couldn't have been vouching
you couldn't have been vouching
they couldn't 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 	
couldn't I vouch?
couldn't you vouch?
couldn't she vouch?
couldn't we vouch?
couldn't you vouch?
couldn't they vouch? 	couldn't I be vouching?
couldn't you be vouching?
couldn't she be vouching?
couldn't we be vouching?
couldn't you be vouching?
couldn't they be vouching? 	couldn't I have vouched?
couldn't you have vouched?
couldn't she have vouched?
couldn't we have vouched?
couldn't you have vouched?
couldn't they have vouched? 	couldn't I have been vouching?
couldn't you have been vouching?
couldn't she have been vouching?
couldn't we have been vouching?
couldn't you have been vouching?
couldn't they have been vouching?