could attest
Verbo regular: attest - attested- attested

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