English verb conjugation
COULD VOUCH

Regular verb: vouch - vouched - vouched

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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

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