English verb conjugation
COULD VOUCH

Regular verb: vouch - vouched - vouched

Affirmation

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