I can burr you can burr he can burr we can burr you can burr they can burr
Forma con V-ing
I can be burring you can be burring he can be burring we can be burring you can be burring they can be burring
Perfecto
I can have burred you can have burred he can have burred we can have burred you can have burred they can have burred
Perfecto con V-ing
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
Negación
Forma simple
I can't burr you can't burr he can't burr we can't burr you can't burr they can't burr
Forma con V-ing
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
Perfecto
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
Perfecto con V-ing
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
Forma interrogativa
Forma simple
can I burr? can you burr? can he burr? can we burr? can you burr? can they burr?
Forma con V-ing
can I be burring? can you be burring? can he be burring? can we be burring? can you be burring? can they be burring?
Perfecto
can I have burred? can you have burred? can he have burred? can we have burred? can you have burred? can they have burred?
Perfecto con V-ing
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?
Forma interro-negativa
Forma simple
can't I burr? can't you burr? can't he burr? can't we burr? can't you burr? can't they burr?
Forma con V-ing
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?
Perfecto
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?
Perfecto con V-ing
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?