I could assert you could assert he could assert we could assert you could assert they could assert
Forma con V-ing
I could be asserting you could be asserting he could be asserting we could be asserting you could be asserting they could be asserting
Perfecto
I could have asserted you could have asserted he could have asserted we could have asserted you could have asserted they could have asserted
Perfecto con V-ing
I could have been asserting you could have been asserting he could have been asserting we could have been asserting you could have been asserting they could have been asserting
Negación
Forma simple
I couldn't assert you couldn't assert he couldn't assert we couldn't assert you couldn't assert they couldn't assert
Forma con V-ing
I couldn't be asserting you couldn't be asserting he couldn't be asserting we couldn't be asserting you couldn't be asserting they couldn't be asserting
Perfecto
I couldn't have asserted you couldn't have asserted he couldn't have asserted we couldn't have asserted you couldn't have asserted they couldn't have asserted
Perfecto con V-ing
I couldn't have been asserting you couldn't have been asserting he couldn't have been asserting we couldn't have been asserting you couldn't have been asserting they couldn't have been asserting
Forma interrogativa
Forma simple
could I assert? could you assert? could he assert? could we assert? could you assert? could they assert?
Forma con V-ing
could I be asserting? could you be asserting? could he be asserting? could we be asserting? could you be asserting? could they be asserting?
Perfecto
could I have asserted? could you have asserted? could he have asserted? could we have asserted? could you have asserted? could they have asserted?
Perfecto con V-ing
could I have been asserting? could you have been asserting? could he have been asserting? could we have been asserting? could you have been asserting? could they have been asserting?
Forma interro-negativa
Forma simple
couldn't I assert? couldn't you assert? couldn't he assert? couldn't we assert? couldn't you assert? couldn't they assert?
Forma con V-ing
couldn't I be asserting? couldn't you be asserting? couldn't he be asserting? couldn't we be asserting? couldn't you be asserting? couldn't they be asserting?
Perfecto
couldn't I have asserted? couldn't you have asserted? couldn't he have asserted? couldn't we have asserted? couldn't you have asserted? couldn't they have asserted?
Perfecto con V-ing
couldn't I have been asserting? couldn't you have been asserting? couldn't he have been asserting? couldn't we have been asserting? couldn't you have been asserting? couldn't they have been asserting?