English verb conjugation
CAN TUMBLE

Regular verb: tumble - tumbled - tumbled

Affirmation

Simple form	V-ing form
I can tumble you can tumble she can tumble we can tumble you can tumble they can tumble	I can be tumbling you can be tumbling she can be tumbling we can be tumbling you can be tumbling they can be tumbling
Perfect	V-ing perfect
I can have tumbled you can have tumbled she can have tumbled we can have tumbled you can have tumbled they can have tumbled	I can have been tumbling you can have been tumbling she can have been tumbling we can have been tumbling you can have been tumbling they can have been tumbling

Negation

Simple form	V-ing form
I can't tumble you can't tumble she can't tumble we can't tumble you can't tumble they can't tumble	I can't be tumbling you can't be tumbling she can't be tumbling we can't be tumbling you can't be tumbling they can't be tumbling
Perfect	V-ing perfect
I can't have tumbled you can't have tumbled she can't have tumbled we can't have tumbled you can't have tumbled they can't have tumbled	I can't have been tumbling you can't have been tumbling she can't have been tumbling we can't have been tumbling you can't have been tumbling they can't have been tumbling

Interrogative form

Simple form	V-ing form
can I tumble? can you tumble? can she tumble? can we tumble? can you tumble? can they tumble?	can I be tumbling? can you be tumbling? can she be tumbling? can we be tumbling? can you be tumbling? can they be tumbling?
Perfect	V-ing perfect
can I have tumbled? can you have tumbled? can she have tumbled? can we have tumbled? can you have tumbled? can they have tumbled?	can I have been tumbling? can you have been tumbling? can she have been tumbling? can we have been tumbling? can you have been tumbling? can they have been tumbling?

Interro-negative form

Simple form	V-ing form
can't I tumble? can't you tumble? can't she tumble? can't we tumble? can't you tumble? can't they tumble?	can't I be tumbling? can't you be tumbling? can't she be tumbling? can't we be tumbling? can't you be tumbling? can't they be tumbling?
Perfect	V-ing perfect
can't I have tumbled? can't you have tumbled? can't she have tumbled? can't we have tumbled? can't you have tumbled? can't they have tumbled?	can't I have been tumbling? can't you have been tumbling? can't she have been tumbling? can't we have been tumbling? can't you have been tumbling? can't they have been tumbling?