I could do you could do she could do we could do you could do they could do
Forma com V-ing
I could be doing you could be doing she could be doing we could be doing you could be doing they could be doing
Perfeito
I could have done you could have done she could have done we could have done you could have done they could have done
Perfeito com V-ing
I could have been doing you could have been doing she could have been doing we could have been doing you could have been doing they could have been doing
Negação
Forma simple
I couldn't do you couldn't do she couldn't do we couldn't do you couldn't do they couldn't do
Forma com V-ing
I couldn't be doing you couldn't be doing she couldn't be doing we couldn't be doing you couldn't be doing they couldn't be doing
Perfeito
I couldn't have done you couldn't have done she couldn't have done we couldn't have done you couldn't have done they couldn't have done
Perfeito com V-ing
I couldn't have been doing you couldn't have been doing she couldn't have been doing we couldn't have been doing you couldn't have been doing they couldn't have been doing
Forma interrogativa
Forma simple
could I do? could you do? could she do? could we do? could you do? could they do?
Forma com V-ing
could I be doing? could you be doing? could she be doing? could we be doing? could you be doing? could they be doing?
Perfeito
could I have done? could you have done? could she have done? could we have done? could you have done? could they have done?
Perfeito com V-ing
could I have been doing? could you have been doing? could she have been doing? could we have been doing? could you have been doing? could they have been doing?
Forma interro-Negação
Forma simple
couldn't I do? couldn't you do? couldn't she do? couldn't we do? couldn't you do? couldn't they do?
Forma com V-ing
couldn't I be doing? couldn't you be doing? couldn't she be doing? couldn't we be doing? couldn't you be doing? couldn't they be doing?
Perfeito
couldn't I have done? couldn't you have done? couldn't she have done? couldn't we have done? couldn't you have done? couldn't they have done?
Perfeito com V-ing
couldn't I have been doing? couldn't you have been doing? couldn't she have been doing? couldn't we have been doing? couldn't you have been doing? couldn't they have been doing?