English verb conjugation
COULD AVOUCH

Regular verb: avouch - avouched - avouched

Affirmation

Simple form	V-ing form
I could avouch you could avouch he could avouch we could avouch you could avouch they could avouch	I could be avouching you could be avouching he could be avouching we could be avouching you could be avouching they could be avouching
Perfect	V-ing perfect
I could have avouched you could have avouched he could have avouched we could have avouched you could have avouched they could have avouched	I could have been avouching you could have been avouching he could have been avouching we could have been avouching you could have been avouching they could have been avouching

Negation

Simple form	V-ing form
I could not avouch you could not avouch he could not avouch we could not avouch you could not avouch they could not avouch	I could not be avouching you could not be avouching he could not be avouching we could not be avouching you could not be avouching they could not be avouching
Perfect	V-ing perfect
I could not have avouched you could not have avouched he could not have avouched we could not have avouched you could not have avouched they could not have avouched	I could not have been avouching you could not have been avouching he could not have been avouching we could not have been avouching you could not have been avouching they could not have been avouching

Interrogative form

Simple form	V-ing form
could I avouch? could you avouch? could he avouch? could we avouch? could you avouch? could they avouch?	could I be avouching? could you be avouching? could he be avouching? could we be avouching? could you be avouching? could they be avouching?
Perfect	V-ing perfect
could I have avouched? could you have avouched? could he have avouched? could we have avouched? could you have avouched? could they have avouched?	could I have been avouching? could you have been avouching? could he have been avouching? could we have been avouching? could you have been avouching? could they have been avouching?

Interro-negative form

Simple form	V-ing form
could I not avouch? could you not avouch? could he not avouch? could we not avouch? could you not avouch? could they not avouch?	could I not be avouching? could you not be avouching? could he not be avouching? could we not be avouching? could you not be avouching? could they not be avouching?
Perfect	V-ing perfect
could I not have avouched? could you not have avouched? could he not have avouched? could we not have avouched? could you not have avouched? could they not have avouched?	could I not have been avouching? could you not have been avouching? could he not have been avouching? could we not have been avouching? could you not have been avouching? could they not have been avouching?