I could start you could start he could start we could start you could start they could start
Forma com V-ing
I could be starting you could be starting he could be starting we could be starting you could be starting they could be starting
Perfeito
I could have started you could have started he could have started we could have started you could have started they could have started
Perfeito com V-ing
I could have been starting you could have been starting he could have been starting we could have been starting you could have been starting they could have been starting
Negação
Forma simple
I could not start you could not start he could not start we could not start you could not start they could not start
Forma com V-ing
I could not be starting you could not be starting he could not be starting we could not be starting you could not be starting they could not be starting
Perfeito
I could not have started you could not have started he could not have started we could not have started you could not have started they could not have started
Perfeito com V-ing
I could not have been starting you could not have been starting he could not have been starting we could not have been starting you could not have been starting they could not have been starting
Forma interrogativa
Forma simple
could I start? could you start? could he start? could we start? could you start? could they start?
Forma com V-ing
could I be starting? could you be starting? could he be starting? could we be starting? could you be starting? could they be starting?
Perfeito
could I have started? could you have started? could he have started? could we have started? could you have started? could they have started?
Perfeito com V-ing
could I have been starting? could you have been starting? could he have been starting? could we have been starting? could you have been starting? could they have been starting?
Forma interro-Negação
Forma simple
could I not start? could you not start? could he not start? could we not start? could you not start? could they not start?
Forma com V-ing
could I not be starting? could you not be starting? could he not be starting? could we not be starting? could you not be starting? could they not be starting?
Perfeito
could I not have started? could you not have started? could he not have started? could we not have started? could you not have started? could they not have started?
Perfeito com V-ing
could I not have been starting? could you not have been starting? could he not have been starting? could we not have been starting? could you not have been starting? could they not have been starting?