could extend
Verbo regular: extend - extended- extended

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could extend
you could extend
she could extend
we could extend
you could extend
they could extend 	I could be extending
you could be extending
she could be extending
we could be extending
you could be extending
they could be extending	I could have extended
you could have extended
she could have extended
we could have extended
you could have extended
they could have extended	I could have been extending
you could have been extending
she could have been extending
we could have been extending
you could have been extending
they could have been extending	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I couldn't extend
you couldn't extend
she couldn't extend
we couldn't extend
you couldn't extend
they couldn't extend 	I couldn't be extending
you couldn't be extending
she couldn't be extending
we couldn't be extending
you couldn't be extending
they couldn't be extending	I couldn't have extended
you couldn't have extended
she couldn't have extended
we couldn't have extended
you couldn't have extended
they couldn't have extended	I couldn't have been extending
you couldn't have been extending
she couldn't have been extending
we couldn't have been extending
you couldn't have been extending
they couldn't have been extending	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I extend?
could you extend?
could she extend?
could we extend?
could you extend?
could they extend? 	could I be extending?
could you be extending?
could she be extending?
could we be extending?
could you be extending?
could they be extending? 	could I have extended?
could you have extended?
could she have extended?
could we have extended?
could you have extended?
could they have extended? 	could I have been extending?
could you have been extending?
could she have been extending?
could we have been extending?
could you have been extending?
could they have been extending? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
couldn't I extend?
couldn't you extend?
couldn't she extend?
couldn't we extend?
couldn't you extend?
couldn't they extend? 	couldn't I be extending?
couldn't you be extending?
couldn't she be extending?
couldn't we be extending?
couldn't you be extending?
couldn't they be extending? 	couldn't I have extended?
couldn't you have extended?
couldn't she have extended?
couldn't we have extended?
couldn't you have extended?
couldn't they have extended? 	couldn't I have been extending?
couldn't you have been extending?
couldn't she have been extending?
couldn't we have been extending?
couldn't you have been extending?
couldn't they have been extending?