I could perceive you could perceive he could perceive we could perceive you could perceive they could perceive
Forma con 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
Perfecto
I could have perceived you could have perceived he could have perceived we could have perceived you could have perceived they could have perceived
Perfecto con 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
Negación
Forma simple
I couldn't perceive you couldn't perceive he couldn't perceive we couldn't perceive you couldn't perceive they couldn't perceive
Forma con V-ing
I couldn't be perceiving you couldn't be perceiving he couldn't be perceiving we couldn't be perceiving you couldn't be perceiving they couldn't be perceiving
Perfecto
I couldn't have perceived you couldn't have perceived he couldn't have perceived we couldn't have perceived you couldn't have perceived they couldn't have perceived
Perfecto con V-ing
I couldn't have been perceiving you couldn't have been perceiving he couldn't have been perceiving we couldn't have been perceiving you couldn't have been perceiving they couldn't 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 con 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?
Perfecto
could I have perceived? could you have perceived? could he have perceived? could we have perceived? could you have perceived? could they have perceived?
Perfecto con 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-negativa
Forma simple
couldn't I perceive? couldn't you perceive? couldn't he perceive? couldn't we perceive? couldn't you perceive? couldn't they perceive?
Forma con V-ing
couldn't I be perceiving? couldn't you be perceiving? couldn't he be perceiving? couldn't we be perceiving? couldn't you be perceiving? couldn't they be perceiving?
Perfecto
couldn't I have perceived? couldn't you have perceived? couldn't he have perceived? couldn't we have perceived? couldn't you have perceived? couldn't they have perceived?
Perfecto con V-ing
couldn't I have been perceiving? couldn't you have been perceiving? couldn't he have been perceiving? couldn't we have been perceiving? couldn't you have been perceiving? couldn't they have been perceiving?