English verb conjugation
CAN MUMBLE

Regular verb: mumble - mumbled - mumbled

Affirmation

Simple form	V-ing form
I can mumble you can mumble he can mumble we can mumble you can mumble they can mumble	I can be mumbling you can be mumbling he can be mumbling we can be mumbling you can be mumbling they can be mumbling
Perfect	V-ing perfect
I can have mumbled you can have mumbled he can have mumbled we can have mumbled you can have mumbled they can have mumbled	I can have been mumbling you can have been mumbling he can have been mumbling we can have been mumbling you can have been mumbling they can have been mumbling

Negation

Simple form	V-ing form
I cannot mumble you cannot mumble he cannot mumble we cannot mumble you cannot mumble they cannot mumble	I cannot be mumbling you cannot be mumbling he cannot be mumbling we cannot be mumbling you cannot be mumbling they cannot be mumbling
Perfect	V-ing perfect
I cannot have mumbled you cannot have mumbled he cannot have mumbled we cannot have mumbled you cannot have mumbled they cannot have mumbled	I cannot have been mumbling you cannot have been mumbling he cannot have been mumbling we cannot have been mumbling you cannot have been mumbling they cannot have been mumbling

Interrogative form

Simple form	V-ing form
can I mumble? can you mumble? can he mumble? can we mumble? can you mumble? can they mumble?	can I be mumbling? can you be mumbling? can he be mumbling? can we be mumbling? can you be mumbling? can they be mumbling?
Perfect	V-ing perfect
can I have mumbled? can you have mumbled? can he have mumbled? can we have mumbled? can you have mumbled? can they have mumbled?	can I have been mumbling? can you have been mumbling? can he have been mumbling? can we have been mumbling? can you have been mumbling? can they have been mumbling?

Interro-negative form

Simple form	V-ing form
can I not mumble? can you not mumble? can he not mumble? can we not mumble? can you not mumble? can they not mumble?	can I not be mumbling? can you not be mumbling? can he not be mumbling? can we not be mumbling? can you not be mumbling? can they not be mumbling?
Perfect	V-ing perfect
can I not have mumbled? can you not have mumbled? can he not have mumbled? can we not have mumbled? can you not have mumbled? can they not have mumbled?	can I not have been mumbling? can you not have been mumbling? can he not have been mumbling? can we not have been mumbling? can you not have been mumbling? can they not have been mumbling?