English verb conjugation
CAN VOUCH

Regular verb: vouch - vouched - vouched

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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
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
Perfect	V-ing perfect
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
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?
Perfect	V-ing perfect
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
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?
Perfect	V-ing perfect
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?