Conjugação do verbo inglês
COULD ATTEST

Verbo regular: attest - attested - attested

Afirmação

Forma simple	Forma com V-ing
I could attest you could attest he could attest we could attest you could attest they could attest	I could be attesting you could be attesting he could be attesting we could be attesting you could be attesting they could be attesting
Perfeito	Perfeito com V-ing
I could have attested you could have attested he could have attested we could have attested you could have attested they could have attested	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

Negação

Forma simple	Forma com V-ing
I could not attest you could not attest he could not attest we could not attest you could not attest they could not attest	I could not be attesting you could not be attesting he could not be attesting we could not be attesting you could not be attesting they could not be attesting
Perfeito	Perfeito com V-ing
I could not have attested you could not have attested he could not have attested we could not have attested you could not have attested they could not have attested	I could not have been attesting you could not have been attesting he could not have been attesting we could not have been attesting you could not have been attesting they could not have been attesting

Forma interrogativa

Forma simple	Forma com V-ing
could I attest? could you attest? could he attest? could we attest? could you attest? could they attest?	could I be attesting? could you be attesting? could he be attesting? could we be attesting? could you be attesting? could they be attesting?
Perfeito	Perfeito com V-ing
could I have attested? could you have attested? could he have attested? could we have attested? could you have attested? could they have attested?	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?

Forma interro-Negação

Forma simple	Forma com V-ing
could I not attest? could you not attest? could he not attest? could we not attest? could you not attest? could they not attest?	could I not be attesting? could you not be attesting? could he not be attesting? could we not be attesting? could you not be attesting? could they not be attesting?
Perfeito	Perfeito com V-ing
could I not have attested? could you not have attested? could he not have attested? could we not have attested? could you not have attested? could they not have attested?	could I not have been attesting? could you not have been attesting? could he not have been attesting? could we not have been attesting? could you not have been attesting? could they not have been attesting?