I could burke you could burke he could burke we could burke you could burke they could burke
Forma con V-ing
I could be burking you could be burking he could be burking we could be burking you could be burking they could be burking
Perfecto
I could have burked you could have burked he could have burked we could have burked you could have burked they could have burked
Perfecto con V-ing
I could have been burking you could have been burking he could have been burking we could have been burking you could have been burking they could have been burking
Negación
Forma simple
I could not burke you could not burke he could not burke we could not burke you could not burke they could not burke
Forma con V-ing
I could not be burking you could not be burking he could not be burking we could not be burking you could not be burking they could not be burking
Perfecto
I could not have burked you could not have burked he could not have burked we could not have burked you could not have burked they could not have burked
Perfecto con V-ing
I could not have been burking you could not have been burking he could not have been burking we could not have been burking you could not have been burking they could not have been burking
Forma interrogativa
Forma simple
could I burke? could you burke? could he burke? could we burke? could you burke? could they burke?
Forma con V-ing
could I be burking? could you be burking? could he be burking? could we be burking? could you be burking? could they be burking?
Perfecto
could I have burked? could you have burked? could he have burked? could we have burked? could you have burked? could they have burked?
Perfecto con V-ing
could I have been burking? could you have been burking? could he have been burking? could we have been burking? could you have been burking? could they have been burking?
Forma interro-negativa
Forma simple
could I not burke? could you not burke? could he not burke? could we not burke? could you not burke? could they not burke?
Forma con V-ing
could I not be burking? could you not be burking? could he not be burking? could we not be burking? could you not be burking? could they not be burking?
Perfecto
could I not have burked? could you not have burked? could he not have burked? could we not have burked? could you not have burked? could they not have burked?
Perfecto con V-ing
could I not have been burking? could you not have been burking? could he not have been burking? could we not have been burking? could you not have been burking? could they not have been burking?