could abstract
Verbo regular: abstract - abstracted- abstracted

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could abstract
you could abstract
he could abstract
we could abstract
you could abstract
they could abstract 	I could be abstracting
you could be abstracting
he could be abstracting
we could be abstracting
you could be abstracting
they could be abstracting	I could have abstracted
you could have abstracted
he could have abstracted
we could have abstracted
you could have abstracted
they could have abstracted	I could have been abstracting
you could have been abstracting
he could have been abstracting
we could have been abstracting
you could have been abstracting
they could have been abstracting	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I couldn't abstract
you couldn't abstract
he couldn't abstract
we couldn't abstract
you couldn't abstract
they couldn't abstract 	I couldn't be abstracting
you couldn't be abstracting
he couldn't be abstracting
we couldn't be abstracting
you couldn't be abstracting
they couldn't be abstracting	I couldn't have abstracted
you couldn't have abstracted
he couldn't have abstracted
we couldn't have abstracted
you couldn't have abstracted
they couldn't have abstracted	I couldn't have been abstracting
you couldn't have been abstracting
he couldn't have been abstracting
we couldn't have been abstracting
you couldn't have been abstracting
they couldn't have been abstracting	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I abstract?
could you abstract?
could he abstract?
could we abstract?
could you abstract?
could they abstract? 	could I be abstracting?
could you be abstracting?
could he be abstracting?
could we be abstracting?
could you be abstracting?
could they be abstracting? 	could I have abstracted?
could you have abstracted?
could he have abstracted?
could we have abstracted?
could you have abstracted?
could they have abstracted? 	could I have been abstracting?
could you have been abstracting?
could he have been abstracting?
could we have been abstracting?
could you have been abstracting?
could they have been abstracting? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
couldn't I abstract?
couldn't you abstract?
couldn't he abstract?
couldn't we abstract?
couldn't you abstract?
couldn't they abstract? 	couldn't I be abstracting?
couldn't you be abstracting?
couldn't he be abstracting?
couldn't we be abstracting?
couldn't you be abstracting?
couldn't they be abstracting? 	couldn't I have abstracted?
couldn't you have abstracted?
couldn't he have abstracted?
couldn't we have abstracted?
couldn't you have abstracted?
couldn't they have abstracted? 	couldn't I have been abstracting?
couldn't you have been abstracting?
couldn't he have been abstracting?
couldn't we have been abstracting?
couldn't you have been abstracting?
couldn't they have been abstracting?