could isolate
Verbo regular: isolate - isolated- isolated

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could isolate
you could isolate
he could isolate
we could isolate
you could isolate
they could isolate 	I could be isolating
you could be isolating
he could be isolating
we could be isolating
you could be isolating
they could be isolating	I could have isolated
you could have isolated
he could have isolated
we could have isolated
you could have isolated
they could have isolated	I could have been isolating
you could have been isolating
he could have been isolating
we could have been isolating
you could have been isolating
they could have been isolating	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could not isolate
you could not isolate
he could not isolate
we could not isolate
you could not isolate
they could not isolate 	I could not be isolating
you could not be isolating
he could not be isolating
we could not be isolating
you could not be isolating
they could not be isolating	I could not have isolated
you could not have isolated
he could not have isolated
we could not have isolated
you could not have isolated
they could not have isolated	I could not have been isolating
you could not have been isolating
he could not have been isolating
we could not have been isolating
you could not have been isolating
they could not have been isolating	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I isolate?
could you isolate?
could he isolate?
could we isolate?
could you isolate?
could they isolate? 	could I be isolating?
could you be isolating?
could he be isolating?
could we be isolating?
could you be isolating?
could they be isolating? 	could I have isolated?
could you have isolated?
could he have isolated?
could we have isolated?
could you have isolated?
could they have isolated? 	could I have been isolating?
could you have been isolating?
could he have been isolating?
could we have been isolating?
could you have been isolating?
could they have been isolating? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I not isolate?
could you not isolate?
could he not isolate?
could we not isolate?
could you not isolate?
could they not isolate? 	could I not be isolating?
could you not be isolating?
could he not be isolating?
could we not be isolating?
could you not be isolating?
could they not be isolating? 	could I not have isolated?
could you not have isolated?
could he not have isolated?
could we not have isolated?
could you not have isolated?
could they not have isolated? 	could I not have been isolating?
could you not have been isolating?
could he not have been isolating?
could we not have been isolating?
could you not have been isolating?
could they not have been isolating?