I could time you could time he could time we could time you could time they could time
Forma com V-ing
I could be timing you could be timing he could be timing we could be timing you could be timing they could be timing
Perfeito
I could have timed you could have timed he could have timed we could have timed you could have timed they could have timed
Perfeito com V-ing
I could have been timing you could have been timing he could have been timing we could have been timing you could have been timing they could have been timing
Negação
Forma simple
I could not time you could not time he could not time we could not time you could not time they could not time
Forma com V-ing
I could not be timing you could not be timing he could not be timing we could not be timing you could not be timing they could not be timing
Perfeito
I could not have timed you could not have timed he could not have timed we could not have timed you could not have timed they could not have timed
Perfeito com V-ing
I could not have been timing you could not have been timing he could not have been timing we could not have been timing you could not have been timing they could not have been timing
Forma interrogativa
Forma simple
could I time? could you time? could he time? could we time? could you time? could they time?
Forma com V-ing
could I be timing? could you be timing? could he be timing? could we be timing? could you be timing? could they be timing?
Perfeito
could I have timed? could you have timed? could he have timed? could we have timed? could you have timed? could they have timed?
Perfeito com V-ing
could I have been timing? could you have been timing? could he have been timing? could we have been timing? could you have been timing? could they have been timing?
Forma interro-Negação
Forma simple
could I not time? could you not time? could he not time? could we not time? could you not time? could they not time?
Forma com V-ing
could I not be timing? could you not be timing? could he not be timing? could we not be timing? could you not be timing? could they not be timing?
Perfeito
could I not have timed? could you not have timed? could he not have timed? could we not have timed? could you not have timed? could they not have timed?
Perfeito com V-ing
could I not have been timing? could you not have been timing? could he not have been timing? could we not have been timing? could you not have been timing? could they not have been timing?