can vouch
Regular verb: vouch - vouched- vouched

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

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't vouch
you can't vouch
he can't vouch
we can't vouch
you can't vouch
they can't vouch 	I can't be vouching
you can't be vouching
he can't be vouching
we can't be vouching
you can't be vouching
they can't be vouching	I can't have vouched
you can't have vouched
he can't have vouched
we can't have vouched
you can't have vouched
they can't have vouched	I can't have been vouching
you can't have been vouching
he can't have been vouching
we can't have been vouching
you can't have been vouching
they can't have been vouching	

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

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I vouch?
can't you vouch?
can't he vouch?
can't we vouch?
can't you vouch?
can't they vouch? 	can't I be vouching?
can't you be vouching?
can't he be vouching?
can't we be vouching?
can't you be vouching?
can't they be vouching? 	can't I have vouched?
can't you have vouched?
can't he have vouched?
can't we have vouched?
can't you have vouched?
can't they have vouched? 	can't I have been vouching?
can't you have been vouching?
can't he have been vouching?
can't we have been vouching?
can't you have been vouching?
can't they have been vouching?