could tiller
Verbo regular: tiller - tillered- tillered

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could tiller
you could tiller
he could tiller
we could tiller
you could tiller
they could tiller 	I could be tillering
you could be tillering
he could be tillering
we could be tillering
you could be tillering
they could be tillering	I could have tillered
you could have tillered
he could have tillered
we could have tillered
you could have tillered
they could have tillered	I could have been tillering
you could have been tillering
he could have been tillering
we could have been tillering
you could have been tillering
they could have been tillering	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could not tiller
you could not tiller
he could not tiller
we could not tiller
you could not tiller
they could not tiller 	I could not be tillering
you could not be tillering
he could not be tillering
we could not be tillering
you could not be tillering
they could not be tillering	I could not have tillered
you could not have tillered
he could not have tillered
we could not have tillered
you could not have tillered
they could not have tillered	I could not have been tillering
you could not have been tillering
he could not have been tillering
we could not have been tillering
you could not have been tillering
they could not have been tillering	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I tiller?
could you tiller?
could he tiller?
could we tiller?
could you tiller?
could they tiller? 	could I be tillering?
could you be tillering?
could he be tillering?
could we be tillering?
could you be tillering?
could they be tillering? 	could I have tillered?
could you have tillered?
could he have tillered?
could we have tillered?
could you have tillered?
could they have tillered? 	could I have been tillering?
could you have been tillering?
could he have been tillering?
could we have been tillering?
could you have been tillering?
could they have been tillering? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I not tiller?
could you not tiller?
could he not tiller?
could we not tiller?
could you not tiller?
could they not tiller? 	could I not be tillering?
could you not be tillering?
could he not be tillering?
could we not be tillering?
could you not be tillering?
could they not be tillering? 	could I not have tillered?
could you not have tillered?
could he not have tillered?
could we not have tillered?
could you not have tillered?
could they not have tillered? 	could I not have been tillering?
could you not have been tillering?
could he not have been tillering?
could we not have been tillering?
could you not have been tillering?
could they not have been tillering?