could prototype
Verbo regular: prototype - prototyped- prototyped

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could prototype
you could prototype
she could prototype
we could prototype
you could prototype
they could prototype 	I could be prototyping
you could be prototyping
she could be prototyping
we could be prototyping
you could be prototyping
they could be prototyping	I could have prototyped
you could have prototyped
she could have prototyped
we could have prototyped
you could have prototyped
they could have prototyped	I could have been prototyping
you could have been prototyping
she could have been prototyping
we could have been prototyping
you could have been prototyping
they could have been prototyping	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not prototype
you could not prototype
she could not prototype
we could not prototype
you could not prototype
they could not prototype 	I could not be prototyping
you could not be prototyping
she could not be prototyping
we could not be prototyping
you could not be prototyping
they could not be prototyping	I could not have prototyped
you could not have prototyped
she could not have prototyped
we could not have prototyped
you could not have prototyped
they could not have prototyped	I could not have been prototyping
you could not have been prototyping
she could not have been prototyping
we could not have been prototyping
you could not have been prototyping
they could not have been prototyping	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I prototype?
could you prototype?
could she prototype?
could we prototype?
could you prototype?
could they prototype? 	could I be prototyping?
could you be prototyping?
could she be prototyping?
could we be prototyping?
could you be prototyping?
could they be prototyping? 	could I have prototyped?
could you have prototyped?
could she have prototyped?
could we have prototyped?
could you have prototyped?
could they have prototyped? 	could I have been prototyping?
could you have been prototyping?
could she have been prototyping?
could we have been prototyping?
could you have been prototyping?
could they have been prototyping? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not prototype?
could you not prototype?
could she not prototype?
could we not prototype?
could you not prototype?
could they not prototype? 	could I not be prototyping?
could you not be prototyping?
could she not be prototyping?
could we not be prototyping?
could you not be prototyping?
could they not be prototyping? 	could I not have prototyped?
could you not have prototyped?
could she not have prototyped?
could we not have prototyped?
could you not have prototyped?
could they not have prototyped? 	could I not have been prototyping?
could you not have been prototyping?
could she not have been prototyping?
could we not have been prototyping?
could you not have been prototyping?
could they not have been prototyping?