I could quit you could quit he could quit we could quit you could quit they could quit
Forma com 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
Perfeito
I could have quit you could have quit he could have quit we could have quit you could have quit they could have quit
Perfeito com 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
Negação
Forma simple
I couldn't quit you couldn't quit he couldn't quit we couldn't quit you couldn't quit they couldn't quit
Forma com V-ing
I couldn't be quitting you couldn't be quitting he couldn't be quitting we couldn't be quitting you couldn't be quitting they couldn't be quitting
Perfeito
I couldn't have quit you couldn't have quit he couldn't have quit we couldn't have quit you couldn't have quit they couldn't have quit
Perfeito com V-ing
I couldn't have been quitting you couldn't have been quitting he couldn't have been quitting we couldn't have been quitting you couldn't have been quitting they couldn't 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 com 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?
Perfeito
could I have quit? could you have quit? could he have quit? could we have quit? could you have quit? could they have quit?
Perfeito com 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-Negação
Forma simple
couldn't I quit? couldn't you quit? couldn't he quit? couldn't we quit? couldn't you quit? couldn't they quit?
Forma com V-ing
couldn't I be quitting? couldn't you be quitting? couldn't he be quitting? couldn't we be quitting? couldn't you be quitting? couldn't they be quitting?
Perfeito
couldn't I have quit? couldn't you have quit? couldn't he have quit? couldn't we have quit? couldn't you have quit? couldn't they have quit?
Perfeito com V-ing
couldn't I have been quitting? couldn't you have been quitting? couldn't he have been quitting? couldn't we have been quitting? couldn't you have been quitting? couldn't they have been quitting?