could rat
Verbo regular: rat - ratted- ratted

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could rat
you could rat
he could rat
we could rat
you could rat
they could rat 	I could be ratting
you could be ratting
he could be ratting
we could be ratting
you could be ratting
they could be ratting	I could have ratted
you could have ratted
he 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
he could have been ratting
we could have been ratting
you could have been ratting
they could have been ratting	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I couldn't rat
you couldn't rat
he couldn't rat
we couldn't rat
you couldn't rat
they couldn't rat 	I couldn't be ratting
you couldn't be ratting
he couldn't be ratting
we couldn't be ratting
you couldn't be ratting
they couldn't be ratting	I couldn't have ratted
you couldn't have ratted
he couldn't have ratted
we couldn't have ratted
you couldn't have ratted
they couldn't have ratted	I couldn't have been ratting
you couldn't have been ratting
he couldn't have been ratting
we couldn't have been ratting
you couldn't have been ratting
they couldn't have been ratting	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I rat?
could you rat?
could he rat?
could we rat?
could you rat?
could they rat? 	could I be ratting?
could you be ratting?
could he be ratting?
could we be ratting?
could you be ratting?
could they be ratting? 	could I have ratted?
could you have ratted?
could he 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 he have been ratting?
could we have been ratting?
could you have been ratting?
could they have been ratting? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
couldn't I rat?
couldn't you rat?
couldn't he rat?
couldn't we rat?
couldn't you rat?
couldn't they rat? 	couldn't I be ratting?
couldn't you be ratting?
couldn't he be ratting?
couldn't we be ratting?
couldn't you be ratting?
couldn't they be ratting? 	couldn't I have ratted?
couldn't you have ratted?
couldn't he have ratted?
couldn't we have ratted?
couldn't you have ratted?
couldn't they have ratted? 	couldn't I have been ratting?
couldn't you have been ratting?
couldn't he have been ratting?
couldn't we have been ratting?
couldn't you have been ratting?
couldn't they have been ratting?