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