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