English verb conjugation
CAN BURR

Regular verb: burr - burred - burred

Affirmation

Simple form	V-ing form
I can burr you can burr she can burr we can burr you can burr they can burr	I can be burring you can be burring she can be burring we can be burring you can be burring they can be burring
Perfect	V-ing perfect
I can have burred you can have burred she can have burred we can have burred you can have burred they can have burred	I can have been burring you can have been burring she can have been burring we can have been burring you can have been burring they can have been burring

Negation

Simple form	V-ing form
I can't burr you can't burr she can't burr we can't burr you can't burr they can't burr	I can't be burring you can't be burring she can't be burring we can't be burring you can't be burring they can't be burring
Perfect	V-ing perfect
I can't have burred you can't have burred she can't have burred we can't have burred you can't have burred they can't have burred	I can't have been burring you can't have been burring she can't have been burring we can't have been burring you can't have been burring they can't have been burring

Interrogative form

Simple form	V-ing form
can I burr? can you burr? can she burr? can we burr? can you burr? can they burr?	can I be burring? can you be burring? can she be burring? can we be burring? can you be burring? can they be burring?
Perfect	V-ing perfect
can I have burred? can you have burred? can she have burred? can we have burred? can you have burred? can they have burred?	can I have been burring? can you have been burring? can she have been burring? can we have been burring? can you have been burring? can they have been burring?

Interro-negative form

Simple form	V-ing form
can't I burr? can't you burr? can't she burr? can't we burr? can't you burr? can't they burr?	can't I be burring? can't you be burring? can't she be burring? can't we be burring? can't you be burring? can't they be burring?
Perfect	V-ing perfect
can't I have burred? can't you have burred? can't she have burred? can't we have burred? can't you have burred? can't they have burred?	can't I have been burring? can't you have been burring? can't she have been burring? can't we have been burring? can't you have been burring? can't they have been burring?