Conjugação do verbo inglês
COULD OPEN

Verbo regular: open - opened - opened

Afirmação

Forma simple	Forma com V-ing
I could open you could open he could open we could open you could open they could open	I could be opening you could be opening he could be opening we could be opening you could be opening they could be opening
Perfeito	Perfeito com V-ing
I could have opened you could have opened he could have opened we could have opened you could have opened they could have opened	I could have been opening you could have been opening he could have been opening we could have been opening you could have been opening they could have been opening

Negação

Forma simple	Forma com V-ing
I couldn't open you couldn't open he couldn't open we couldn't open you couldn't open they couldn't open	I couldn't be opening you couldn't be opening he couldn't be opening we couldn't be opening you couldn't be opening they couldn't be opening
Perfeito	Perfeito com V-ing
I couldn't have opened you couldn't have opened he couldn't have opened we couldn't have opened you couldn't have opened they couldn't have opened	I couldn't have been opening you couldn't have been opening he couldn't have been opening we couldn't have been opening you couldn't have been opening they couldn't have been opening

Forma interrogativa

Forma simple	Forma com V-ing
could I open? could you open? could he open? could we open? could you open? could they open?	could I be opening? could you be opening? could he be opening? could we be opening? could you be opening? could they be opening?
Perfeito	Perfeito com V-ing
could I have opened? could you have opened? could he have opened? could we have opened? could you have opened? could they have opened?	could I have been opening? could you have been opening? could he have been opening? could we have been opening? could you have been opening? could they have been opening?

Forma interro-Negação

Forma simple	Forma com V-ing
couldn't I open? couldn't you open? couldn't he open? couldn't we open? couldn't you open? couldn't they open?	couldn't I be opening? couldn't you be opening? couldn't he be opening? couldn't we be opening? couldn't you be opening? couldn't they be opening?
Perfeito	Perfeito com V-ing
couldn't I have opened? couldn't you have opened? couldn't he have opened? couldn't we have opened? couldn't you have opened? couldn't they have opened?	couldn't I have been opening? couldn't you have been opening? couldn't he have been opening? couldn't we have been opening? couldn't you have been opening? couldn't they have been opening?