could crumble
Verbo regolare: crumble - crumbled- crumbled

Affermazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I could crumble
you could crumble
he could crumble
we could crumble
you could crumble
they could crumble 	I could be crumbling
you could be crumbling
he could be crumbling
we could be crumbling
you could be crumbling
they could be crumbling	I could have crumbled
you could have crumbled
he could have crumbled
we could have crumbled
you could have crumbled
they could have crumbled	I could have been crumbling
you could have been crumbling
he could have been crumbling
we could have been crumbling
you could have been crumbling
they could have been crumbling	

Negazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I could not crumble
you could not crumble
he could not crumble
we could not crumble
you could not crumble
they could not crumble 	I could not be crumbling
you could not be crumbling
he could not be crumbling
we could not be crumbling
you could not be crumbling
they could not be crumbling	I could not have crumbled
you could not have crumbled
he could not have crumbled
we could not have crumbled
you could not have crumbled
they could not have crumbled	I could not have been crumbling
you could not have been crumbling
he could not have been crumbling
we could not have been crumbling
you could not have been crumbling
they could not have been crumbling	

Forma interrogativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
could I crumble?
could you crumble?
could he crumble?
could we crumble?
could you crumble?
could they crumble? 	could I be crumbling?
could you be crumbling?
could he be crumbling?
could we be crumbling?
could you be crumbling?
could they be crumbling? 	could I have crumbled?
could you have crumbled?
could he have crumbled?
could we have crumbled?
could you have crumbled?
could they have crumbled? 	could I have been crumbling?
could you have been crumbling?
could he have been crumbling?
could we have been crumbling?
could you have been crumbling?
could they have been crumbling? 	

Forma interro-negativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
could I not crumble?
could you not crumble?
could he not crumble?
could we not crumble?
could you not crumble?
could they not crumble? 	could I not be crumbling?
could you not be crumbling?
could he not be crumbling?
could we not be crumbling?
could you not be crumbling?
could they not be crumbling? 	could I not have crumbled?
could you not have crumbled?
could he not have crumbled?
could we not have crumbled?
could you not have crumbled?
could they not have crumbled? 	could I not have been crumbling?
could you not have been crumbling?
could he not have been crumbling?
could we not have been crumbling?
could you not have been crumbling?
could they not have been crumbling?