I can attest you can attest he can attest we can attest you can attest they can attest
Forma com V-ing
I can be attesting you can be attesting he can be attesting we can be attesting you can be attesting they can be attesting
Perfeito
I can have attested you can have attested he can have attested we can have attested you can have attested they can have attested
Perfeito com V-ing
I can have been attesting you can have been attesting he can have been attesting we can have been attesting you can have been attesting they can have been attesting
Negação
Forma simple
I cannot attest you cannot attest he cannot attest we cannot attest you cannot attest they cannot attest
Forma com V-ing
I cannot be attesting you cannot be attesting he cannot be attesting we cannot be attesting you cannot be attesting they cannot be attesting
Perfeito
I cannot have attested you cannot have attested he cannot have attested we cannot have attested you cannot have attested they cannot have attested
Perfeito com V-ing
I cannot have been attesting you cannot have been attesting he cannot have been attesting we cannot have been attesting you cannot have been attesting they cannot have been attesting
Forma interrogativa
Forma simple
can I attest? can you attest? can he attest? can we attest? can you attest? can they attest?
Forma com V-ing
can I be attesting? can you be attesting? can he be attesting? can we be attesting? can you be attesting? can they be attesting?
Perfeito
can I have attested? can you have attested? can he have attested? can we have attested? can you have attested? can they have attested?
Perfeito com V-ing
can I have been attesting? can you have been attesting? can he have been attesting? can we have been attesting? can you have been attesting? can they have been attesting?
Forma interro-Negação
Forma simple
can I not attest? can you not attest? can he not attest? can we not attest? can you not attest? can they not attest?
Forma com V-ing
can I not be attesting? can you not be attesting? can he not be attesting? can we not be attesting? can you not be attesting? can they not be attesting?
Perfeito
can I not have attested? can you not have attested? can he not have attested? can we not have attested? can you not have attested? can they not have attested?
Perfeito com V-ing
can I not have been attesting? can you not have been attesting? can he not have been attesting? can we not have been attesting? can you not have been attesting? can they not have been attesting?