I could perceive you could perceive he could perceive we could perceive you could perceive they could perceive
Forma com V-ing
I could be perceiving you could be perceiving he could be perceiving we could be perceiving you could be perceiving they could be perceiving
Perfeito
I could have perceived you could have perceived he could have perceived we could have perceived you could have perceived they could have perceived
Perfeito com V-ing
I could have been perceiving you could have been perceiving he could have been perceiving we could have been perceiving you could have been perceiving they could have been perceiving
Negação
Forma simple
I could not perceive you could not perceive he could not perceive we could not perceive you could not perceive they could not perceive
Forma com V-ing
I could not be perceiving you could not be perceiving he could not be perceiving we could not be perceiving you could not be perceiving they could not be perceiving
Perfeito
I could not have perceived you could not have perceived he could not have perceived we could not have perceived you could not have perceived they could not have perceived
Perfeito com V-ing
I could not have been perceiving you could not have been perceiving he could not have been perceiving we could not have been perceiving you could not have been perceiving they could not have been perceiving
Forma interrogativa
Forma simple
could I perceive? could you perceive? could he perceive? could we perceive? could you perceive? could they perceive?
Forma com V-ing
could I be perceiving? could you be perceiving? could he be perceiving? could we be perceiving? could you be perceiving? could they be perceiving?
Perfeito
could I have perceived? could you have perceived? could he have perceived? could we have perceived? could you have perceived? could they have perceived?
Perfeito com V-ing
could I have been perceiving? could you have been perceiving? could he have been perceiving? could we have been perceiving? could you have been perceiving? could they have been perceiving?
Forma interro-Negação
Forma simple
could I not perceive? could you not perceive? could he not perceive? could we not perceive? could you not perceive? could they not perceive?
Forma com V-ing
could I not be perceiving? could you not be perceiving? could he not be perceiving? could we not be perceiving? could you not be perceiving? could they not be perceiving?
Perfeito
could I not have perceived? could you not have perceived? could he not have perceived? could we not have perceived? could you not have perceived? could they not have perceived?
Perfeito com V-ing
could I not have been perceiving? could you not have been perceiving? could he not have been perceiving? could we not have been perceiving? could you not have been perceiving? could they not have been perceiving?