could grunt
Verbo regular: grunt - grunted- grunted

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could grunt
you could grunt
he could grunt
we could grunt
you could grunt
they could grunt 	I could be grunting
you could be grunting
he could be grunting
we could be grunting
you could be grunting
they could be grunting	I could have grunted
you could have grunted
he could have grunted
we could have grunted
you could have grunted
they could have grunted	I could have been grunting
you could have been grunting
he could have been grunting
we could have been grunting
you could have been grunting
they could have been grunting	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I couldn't grunt
you couldn't grunt
he couldn't grunt
we couldn't grunt
you couldn't grunt
they couldn't grunt 	I couldn't be grunting
you couldn't be grunting
he couldn't be grunting
we couldn't be grunting
you couldn't be grunting
they couldn't be grunting	I couldn't have grunted
you couldn't have grunted
he couldn't have grunted
we couldn't have grunted
you couldn't have grunted
they couldn't have grunted	I couldn't have been grunting
you couldn't have been grunting
he couldn't have been grunting
we couldn't have been grunting
you couldn't have been grunting
they couldn't have been grunting	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I grunt?
could you grunt?
could he grunt?
could we grunt?
could you grunt?
could they grunt? 	could I be grunting?
could you be grunting?
could he be grunting?
could we be grunting?
could you be grunting?
could they be grunting? 	could I have grunted?
could you have grunted?
could he have grunted?
could we have grunted?
could you have grunted?
could they have grunted? 	could I have been grunting?
could you have been grunting?
could he have been grunting?
could we have been grunting?
could you have been grunting?
could they have been grunting? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
couldn't I grunt?
couldn't you grunt?
couldn't he grunt?
couldn't we grunt?
couldn't you grunt?
couldn't they grunt? 	couldn't I be grunting?
couldn't you be grunting?
couldn't he be grunting?
couldn't we be grunting?
couldn't you be grunting?
couldn't they be grunting? 	couldn't I have grunted?
couldn't you have grunted?
couldn't he have grunted?
couldn't we have grunted?
couldn't you have grunted?
couldn't they have grunted? 	couldn't I have been grunting?
couldn't you have been grunting?
couldn't he have been grunting?
couldn't we have been grunting?
couldn't you have been grunting?
couldn't they have been grunting?