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 cannot vouch you cannot vouch he cannot vouch we cannot vouch you cannot vouch they cannot vouch	I cannot be vouching you cannot be vouching he cannot be vouching we cannot be vouching you cannot be vouching they cannot be vouching
Perfect	V-ing perfect
I cannot have vouched you cannot have vouched he cannot have vouched we cannot have vouched you cannot have vouched they cannot have vouched	I cannot have been vouching you cannot have been vouching he cannot have been vouching we cannot have been vouching you cannot have been vouching they cannot 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 I not vouch? can you not vouch? can he not vouch? can we not vouch? can you not vouch? can they not vouch?	can I not be vouching? can you not be vouching? can he not be vouching? can we not be vouching? can you not be vouching? can they not be vouching?
Perfect	V-ing perfect
can I not have vouched? can you not have vouched? can he not have vouched? can we not have vouched? can you not have vouched? can they not have vouched?	can I not have been vouching? can you not have been vouching? can he not have been vouching? can we not have been vouching? can you not have been vouching? can they not have been vouching?