Conjugação do verbo inglês
COULD ASSERT

Verbo regular: assert - asserted - asserted

Afirmação

Forma simple	Forma com V-ing
I could assert you could assert he could assert we could assert you could assert they could assert	I could be asserting you could be asserting he could be asserting we could be asserting you could be asserting they could be asserting
Perfeito	Perfeito com V-ing
I could have asserted you could have asserted he could have asserted we could have asserted you could have asserted they could have asserted	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

Negação

Forma simple	Forma com V-ing
I couldn't assert you couldn't assert he couldn't assert we couldn't assert you couldn't assert they couldn't assert	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
Perfeito	Perfeito com V-ing
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	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	Forma com V-ing
could I assert? could you assert? could he assert? could we assert? could you assert? could they assert?	could I be asserting? could you be asserting? could he be asserting? could we be asserting? could you be asserting? could they be asserting?
Perfeito	Perfeito com V-ing
could I have asserted? could you have asserted? could he have asserted? could we have asserted? could you have asserted? could they have asserted?	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-Negação

Forma simple	Forma com V-ing
couldn't I assert? couldn't you assert? couldn't he assert? couldn't we assert? couldn't you assert? couldn't they assert?	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?
Perfeito	Perfeito com V-ing
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?	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?