could last
Verbo regular: last - lasted- lasted

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could last
you could last
he could last
we could last
you could last
they could last 	I could be lasting
you could be lasting
he could be lasting
we could be lasting
you could be lasting
they could be lasting	I could have lasted
you could have lasted
he could have lasted
we could have lasted
you could have lasted
they could have lasted	I could have been lasting
you could have been lasting
he could have been lasting
we could have been lasting
you could have been lasting
they could have been lasting	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I couldn't last
you couldn't last
he couldn't last
we couldn't last
you couldn't last
they couldn't last 	I couldn't be lasting
you couldn't be lasting
he couldn't be lasting
we couldn't be lasting
you couldn't be lasting
they couldn't be lasting	I couldn't have lasted
you couldn't have lasted
he couldn't have lasted
we couldn't have lasted
you couldn't have lasted
they couldn't have lasted	I couldn't have been lasting
you couldn't have been lasting
he couldn't have been lasting
we couldn't have been lasting
you couldn't have been lasting
they couldn't have been lasting	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I last?
could you last?
could he last?
could we last?
could you last?
could they last? 	could I be lasting?
could you be lasting?
could he be lasting?
could we be lasting?
could you be lasting?
could they be lasting? 	could I have lasted?
could you have lasted?
could he have lasted?
could we have lasted?
could you have lasted?
could they have lasted? 	could I have been lasting?
could you have been lasting?
could he have been lasting?
could we have been lasting?
could you have been lasting?
could they have been lasting? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
couldn't I last?
couldn't you last?
couldn't he last?
couldn't we last?
couldn't you last?
couldn't they last? 	couldn't I be lasting?
couldn't you be lasting?
couldn't he be lasting?
couldn't we be lasting?
couldn't you be lasting?
couldn't they be lasting? 	couldn't I have lasted?
couldn't you have lasted?
couldn't he have lasted?
couldn't we have lasted?
couldn't you have lasted?
couldn't they have lasted? 	couldn't I have been lasting?
couldn't you have been lasting?
couldn't he have been lasting?
couldn't we have been lasting?
couldn't you have been lasting?
couldn't they have been lasting?