I could start you could start she could start we could start you could start they could start
Forma con V-ing
I could be starting you could be starting she could be starting we could be starting you could be starting they could be starting
Perfecto
I could have started you could have started she could have started we could have started you could have started they could have started
Perfecto con V-ing
I could have been starting you could have been starting she could have been starting we could have been starting you could have been starting they could have been starting
Negación
Forma simple
I couldn't start you couldn't start she couldn't start we couldn't start you couldn't start they couldn't start
Forma con V-ing
I couldn't be starting you couldn't be starting she couldn't be starting we couldn't be starting you couldn't be starting they couldn't be starting
Perfecto
I couldn't have started you couldn't have started she couldn't have started we couldn't have started you couldn't have started they couldn't have started
Perfecto con V-ing
I couldn't have been starting you couldn't have been starting she 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 she start? could we start? could you start? could they start?
Forma con V-ing
could I be starting? could you be starting? could she be starting? could we be starting? could you be starting? could they be starting?
Perfecto
could I have started? could you have started? could she have started? could we have started? could you have started? could they have started?
Perfecto con V-ing
could I have been starting? could you have been starting? could she have been starting? could we have been starting? could you have been starting? could they have been starting?
Forma interro-negativa
Forma simple
couldn't I start? couldn't you start? couldn't she start? couldn't we start? couldn't you start? couldn't they start?
Forma con V-ing
couldn't I be starting? couldn't you be starting? couldn't she be starting? couldn't we be starting? couldn't you be starting? couldn't they be starting?
Perfecto
couldn't I have started? couldn't you have started? couldn't she have started? couldn't we have started? couldn't you have started? couldn't they have started?
Perfecto con V-ing
couldn't I have been starting? couldn't you have been starting? couldn't she have been starting? couldn't we have been starting? couldn't you have been starting? couldn't they have been starting?