I could bur you could bur he could bur we could bur you could bur they could bur
Forma com V-ing
I could be buring you could be buring he could be buring we could be buring you could be buring they could be buring
Perfeito
I could have bured you could have bured he could have bured we could have bured you could have bured they could have bured
Perfeito com V-ing
I could have been buring you could have been buring he could have been buring we could have been buring you could have been buring they could have been buring
Negação
Forma simple
I could not bur you could not bur he could not bur we could not bur you could not bur they could not bur
Forma com V-ing
I could not be buring you could not be buring he could not be buring we could not be buring you could not be buring they could not be buring
Perfeito
I could not have bured you could not have bured he could not have bured we could not have bured you could not have bured they could not have bured
Perfeito com V-ing
I could not have been buring you could not have been buring he could not have been buring we could not have been buring you could not have been buring they could not have been buring
Forma interrogativa
Forma simple
could I bur? could you bur? could he bur? could we bur? could you bur? could they bur?
Forma com V-ing
could I be buring? could you be buring? could he be buring? could we be buring? could you be buring? could they be buring?
Perfeito
could I have bured? could you have bured? could he have bured? could we have bured? could you have bured? could they have bured?
Perfeito com V-ing
could I have been buring? could you have been buring? could he have been buring? could we have been buring? could you have been buring? could they have been buring?
Forma interro-Negação
Forma simple
could I not bur? could you not bur? could he not bur? could we not bur? could you not bur? could they not bur?
Forma com V-ing
could I not be buring? could you not be buring? could he not be buring? could we not be buring? could you not be buring? could they not be buring?
Perfeito
could I not have bured? could you not have bured? could he not have bured? could we not have bured? could you not have bured? could they not have bured?
Perfeito com V-ing
could I not have been buring? could you not have been buring? could he not have been buring? could we not have been buring? could you not have been buring? could they not have been buring?