could rat
Verbo regular: rat - ratted- ratted

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could rat
you could rat
she could rat
we could rat
you could rat
they could rat 	I could be ratting
you could be ratting
she could be ratting
we could be ratting
you could be ratting
they could be ratting	I could have ratted
you could have ratted
she could have ratted
we could have ratted
you could have ratted
they could have ratted	I could have been ratting
you could have been ratting
she could have been ratting
we could have been ratting
you could have been ratting
they could have been ratting	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not rat
you could not rat
she could not rat
we could not rat
you could not rat
they could not rat 	I could not be ratting
you could not be ratting
she could not be ratting
we could not be ratting
you could not be ratting
they could not be ratting	I could not have ratted
you could not have ratted
she could not have ratted
we could not have ratted
you could not have ratted
they could not have ratted	I could not have been ratting
you could not have been ratting
she could not have been ratting
we could not have been ratting
you could not have been ratting
they could not have been ratting	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I rat?
could you rat?
could she rat?
could we rat?
could you rat?
could they rat? 	could I be ratting?
could you be ratting?
could she be ratting?
could we be ratting?
could you be ratting?
could they be ratting? 	could I have ratted?
could you have ratted?
could she have ratted?
could we have ratted?
could you have ratted?
could they have ratted? 	could I have been ratting?
could you have been ratting?
could she have been ratting?
could we have been ratting?
could you have been ratting?
could they have been ratting? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not rat?
could you not rat?
could she not rat?
could we not rat?
could you not rat?
could they not rat? 	could I not be ratting?
could you not be ratting?
could she not be ratting?
could we not be ratting?
could you not be ratting?
could they not be ratting? 	could I not have ratted?
could you not have ratted?
could she not have ratted?
could we not have ratted?
could you not have ratted?
could they not have ratted? 	could I not have been ratting?
could you not have been ratting?
could she not have been ratting?
could we not have been ratting?
could you not have been ratting?
could they not have been ratting?