I could attest you could attest he could attest we could attest you could attest they could attest
Forme en V-ing
I could be attesting you could be attesting he could be attesting we could be attesting you could be attesting they could be attesting
Perfect
I could have attested you could have attested he could have attested we could have attested you could have attested they could have attested
Perfect en V-ing
I could have been attesting you could have been attesting he could have been attesting we could have been attesting you could have been attesting they could have been attesting
Négation
Forme simple
I couldn't attest you couldn't attest he couldn't attest we couldn't attest you couldn't attest they couldn't attest
Forme en V-ing
I couldn't be attesting you couldn't be attesting he couldn't be attesting we couldn't be attesting you couldn't be attesting they couldn't be attesting
Perfect
I couldn't have attested you couldn't have attested he couldn't have attested we couldn't have attested you couldn't have attested they couldn't have attested
Perfect en V-ing
I couldn't have been attesting you couldn't have been attesting he couldn't have been attesting we couldn't have been attesting you couldn't have been attesting they couldn't have been attesting
Forme interrogative
Forme simple
could I attest? could you attest? could he attest? could we attest? could you attest? could they attest?
Forme en V-ing
could I be attesting? could you be attesting? could he be attesting? could we be attesting? could you be attesting? could they be attesting?
Perfect
could I have attested? could you have attested? could he have attested? could we have attested? could you have attested? could they have attested?
Perfect en V-ing
could I have been attesting? could you have been attesting? could he have been attesting? could we have been attesting? could you have been attesting? could they have been attesting?
Forme interro-négative
Forme simple
couldn't I attest? couldn't you attest? couldn't he attest? couldn't we attest? couldn't you attest? couldn't they attest?
Forme en V-ing
couldn't I be attesting? couldn't you be attesting? couldn't he be attesting? couldn't we be attesting? couldn't you be attesting? couldn't they be attesting?
Perfect
couldn't I have attested? couldn't you have attested? couldn't he have attested? couldn't we have attested? couldn't you have attested? couldn't they have attested?
Perfect en V-ing
couldn't I have been attesting? couldn't you have been attesting? couldn't he have been attesting? couldn't we have been attesting? couldn't you have been attesting? couldn't they have been attesting?