I can avouch you can avouch he can avouch we can avouch you can avouch they can avouch
Forme en V-ing
I can be avouching you can be avouching he can be avouching we can be avouching you can be avouching they can be avouching
Perfect
I can have avouched you can have avouched he can have avouched we can have avouched you can have avouched they can have avouched
Perfect en V-ing
I can have been avouching you can have been avouching he can have been avouching we can have been avouching you can have been avouching they can have been avouching
Négation
Forme simple
I can't avouch you can't avouch he can't avouch we can't avouch you can't avouch they can't avouch
Forme en V-ing
I can't be avouching you can't be avouching he can't be avouching we can't be avouching you can't be avouching they can't be avouching
Perfect
I can't have avouched you can't have avouched he can't have avouched we can't have avouched you can't have avouched they can't have avouched
Perfect en V-ing
I can't have been avouching you can't have been avouching he can't have been avouching we can't have been avouching you can't have been avouching they can't have been avouching
Forme interrogative
Forme simple
can I avouch? can you avouch? can he avouch? can we avouch? can you avouch? can they avouch?
Forme en V-ing
can I be avouching? can you be avouching? can he be avouching? can we be avouching? can you be avouching? can they be avouching?
Perfect
can I have avouched? can you have avouched? can he have avouched? can we have avouched? can you have avouched? can they have avouched?
Perfect en V-ing
can I have been avouching? can you have been avouching? can he have been avouching? can we have been avouching? can you have been avouching? can they have been avouching?
Forme interro-négative
Forme simple
can't I avouch? can't you avouch? can't he avouch? can't we avouch? can't you avouch? can't they avouch?
Forme en V-ing
can't I be avouching? can't you be avouching? can't he be avouching? can't we be avouching? can't you be avouching? can't they be avouching?
Perfect
can't I have avouched? can't you have avouched? can't he have avouched? can't we have avouched? can't you have avouched? can't they have avouched?
Perfect en V-ing
can't I have been avouching? can't you have been avouching? can't he have been avouching? can't we have been avouching? can't you have been avouching? can't they have been avouching?