can crumble
Verbo regular: crumble - crumbled- crumbled

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I can crumble
you can crumble
he can crumble
we can crumble
you can crumble
they can crumble 	I can be crumbling
you can be crumbling
he can be crumbling
we can be crumbling
you can be crumbling
they can be crumbling	I can have crumbled
you can have crumbled
he can have crumbled
we can have crumbled
you can have crumbled
they can have crumbled	I can have been crumbling
you can have been crumbling
he can have been crumbling
we can have been crumbling
you can have been crumbling
they can have been crumbling	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I cannot crumble
you cannot crumble
he cannot crumble
we cannot crumble
you cannot crumble
they cannot crumble 	I cannot be crumbling
you cannot be crumbling
he cannot be crumbling
we cannot be crumbling
you cannot be crumbling
they cannot be crumbling	I cannot have crumbled
you cannot have crumbled
he cannot have crumbled
we cannot have crumbled
you cannot have crumbled
they cannot have crumbled	I cannot have been crumbling
you cannot have been crumbling
he cannot have been crumbling
we cannot have been crumbling
you cannot have been crumbling
they cannot have been crumbling	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
can I crumble?
can you crumble?
can he crumble?
can we crumble?
can you crumble?
can they crumble? 	can I be crumbling?
can you be crumbling?
can he be crumbling?
can we be crumbling?
can you be crumbling?
can they be crumbling? 	can I have crumbled?
can you have crumbled?
can he have crumbled?
can we have crumbled?
can you have crumbled?
can they have crumbled? 	can I have been crumbling?
can you have been crumbling?
can he have been crumbling?
can we have been crumbling?
can you have been crumbling?
can they have been crumbling? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
can I not crumble?
can you not crumble?
can he not crumble?
can we not crumble?
can you not crumble?
can they not crumble? 	can I not be crumbling?
can you not be crumbling?
can he not be crumbling?
can we not be crumbling?
can you not be crumbling?
can they not be crumbling? 	can I not have crumbled?
can you not have crumbled?
can he not have crumbled?
can we not have crumbled?
can you not have crumbled?
can they not have crumbled? 	can I not have been crumbling?
can you not have been crumbling?
can he not have been crumbling?
can we not have been crumbling?
can you not have been crumbling?
can they not have been crumbling?