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 couldn't start you couldn't start he couldn't start we couldn't start you couldn't start they couldn't start
Forma com V-ing
I couldn't be starting you couldn't be starting he couldn't be starting we couldn't be starting you couldn't be starting they couldn't be starting
Perfeito
I couldn't have started you couldn't have started he couldn't have started we couldn't have started you couldn't have started they couldn't have started
Perfeito com V-ing
I couldn't have been starting you couldn't have been starting he couldn't have been starting we couldn't have been starting you couldn't have been starting they couldn't 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
couldn't I start? couldn't you start? couldn't he start? couldn't we start? couldn't you start? couldn't they start?
Forma com V-ing
couldn't I be starting? couldn't you be starting? couldn't he be starting? couldn't we be starting? couldn't you be starting? couldn't they be starting?
Perfeito
couldn't I have started? couldn't you have started? couldn't he have started? couldn't we have started? couldn't you have started? couldn't they have started?
Perfeito com V-ing
couldn't I have been starting? couldn't you have been starting? couldn't he have been starting? couldn't we have been starting? couldn't you have been starting? couldn't they have been starting?