I can caution you can caution he can caution we can caution you can caution they can caution
Forme en V-ing
I can be cautioning you can be cautioning he can be cautioning we can be cautioning you can be cautioning they can be cautioning
Perfect
I can have cautioned you can have cautioned he can have cautioned we can have cautioned you can have cautioned they can have cautioned
Perfect en V-ing
I can have been cautioning you can have been cautioning he can have been cautioning we can have been cautioning you can have been cautioning they can have been cautioning
Négation
Forme simple
I cannot caution you cannot caution he cannot caution we cannot caution you cannot caution they cannot caution
Forme en V-ing
I cannot be cautioning you cannot be cautioning he cannot be cautioning we cannot be cautioning you cannot be cautioning they cannot be cautioning
Perfect
I cannot have cautioned you cannot have cautioned he cannot have cautioned we cannot have cautioned you cannot have cautioned they cannot have cautioned
Perfect en V-ing
I cannot have been cautioning you cannot have been cautioning he cannot have been cautioning we cannot have been cautioning you cannot have been cautioning they cannot have been cautioning
Forme interrogative
Forme simple
can I caution? can you caution? can he caution? can we caution? can you caution? can they caution?
Forme en V-ing
can I be cautioning? can you be cautioning? can he be cautioning? can we be cautioning? can you be cautioning? can they be cautioning?
Perfect
can I have cautioned? can you have cautioned? can he have cautioned? can we have cautioned? can you have cautioned? can they have cautioned?
Perfect en V-ing
can I have been cautioning? can you have been cautioning? can he have been cautioning? can we have been cautioning? can you have been cautioning? can they have been cautioning?
Forme interro-négative
Forme simple
can I not caution? can you not caution? can he not caution? can we not caution? can you not caution? can they not caution?
Forme en V-ing
can I not be cautioning? can you not be cautioning? can he not be cautioning? can we not be cautioning? can you not be cautioning? can they not be cautioning?
Perfect
can I not have cautioned? can you not have cautioned? can he not have cautioned? can we not have cautioned? can you not have cautioned? can they not have cautioned?
Perfect en V-ing
can I not have been cautioning? can you not have been cautioning? can he not have been cautioning? can we not have been cautioning? can you not have been cautioning? can they not have been cautioning?