English verb conjugation
CAN CRUMBLE

Regular verb: crumble - crumbled - crumbled

Affirmation

Simple form	V-ing form
I can crumble you can crumble she can crumble we can crumble you can crumble they can crumble	I can be crumbling you can be crumbling she can be crumbling we can be crumbling you can be crumbling they can be crumbling
Perfect	V-ing perfect
I can have crumbled you can have crumbled she 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 she can have been crumbling we can have been crumbling you can have been crumbling they can have been crumbling

Negation

Simple form	V-ing form
I cannot crumble you cannot crumble she cannot crumble we cannot crumble you cannot crumble they cannot crumble	I cannot be crumbling you cannot be crumbling she cannot be crumbling we cannot be crumbling you cannot be crumbling they cannot be crumbling
Perfect	V-ing perfect
I cannot have crumbled you cannot have crumbled she 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 she cannot have been crumbling we cannot have been crumbling you cannot have been crumbling they cannot have been crumbling

Interrogative form

Simple form	V-ing form
can I crumble? can you crumble? can she crumble? can we crumble? can you crumble? can they crumble?	can I be crumbling? can you be crumbling? can she be crumbling? can we be crumbling? can you be crumbling? can they be crumbling?
Perfect	V-ing perfect
can I have crumbled? can you have crumbled? can she 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 she have been crumbling? can we have been crumbling? can you have been crumbling? can they have been crumbling?

Interro-negative form

Simple form	V-ing form
can I not crumble? can you not crumble? can she 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 she not be crumbling? can we not be crumbling? can you not be crumbling? can they not be crumbling?
Perfect	V-ing perfect
can I not have crumbled? can you not have crumbled? can she 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 she not have been crumbling? can we not have been crumbling? can you not have been crumbling? can they not have been crumbling?