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 can't crumble you can't crumble she can't crumble we can't crumble you can't crumble they can't crumble	I can't be crumbling you can't be crumbling she can't be crumbling we can't be crumbling you can't be crumbling they can't be crumbling
Perfect	V-ing perfect
I can't have crumbled you can't have crumbled she can't have crumbled we can't have crumbled you can't have crumbled they can't have crumbled	I can't have been crumbling you can't have been crumbling she can't have been crumbling we can't have been crumbling you can't have been crumbling they can't 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't I crumble? can't you crumble? can't she crumble? can't we crumble? can't you crumble? can't they crumble?	can't I be crumbling? can't you be crumbling? can't she be crumbling? can't we be crumbling? can't you be crumbling? can't they be crumbling?
Perfect	V-ing perfect
can't I have crumbled? can't you have crumbled? can't she have crumbled? can't we have crumbled? can't you have crumbled? can't they have crumbled?	can't I have been crumbling? can't you have been crumbling? can't she have been crumbling? can't we have been crumbling? can't you have been crumbling? can't they have been crumbling?