English verb conjugation
CAN BURR

Regular verb: burr - burred - burred

Affirmation

Simple form	V-ing form
I can burr you can burr he can burr we can burr you can burr they can burr	I can be burring you can be burring he 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 he 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 he 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 he 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 he 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 he 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 he 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 he burr? can we burr? can you burr? can they burr?	can I be burring? can you be burring? can he 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 he 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 he 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 he 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 he 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 he 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 he have been burring? can't we have been burring? can't you have been burring? can't they have been burring?