I could screen you could screen he could screen we could screen you could screen they could screen
Forma com V-ing
I could be screening you could be screening he could be screening we could be screening you could be screening they could be screening
Perfeito
I could have screened you could have screened he could have screened we could have screened you could have screened they could have screened
Perfeito com V-ing
I could have been screening you could have been screening he could have been screening we could have been screening you could have been screening they could have been screening
Negação
Forma simple
I couldn't screen you couldn't screen he couldn't screen we couldn't screen you couldn't screen they couldn't screen
Forma com V-ing
I couldn't be screening you couldn't be screening he couldn't be screening we couldn't be screening you couldn't be screening they couldn't be screening
Perfeito
I couldn't have screened you couldn't have screened he couldn't have screened we couldn't have screened you couldn't have screened they couldn't have screened
Perfeito com V-ing
I couldn't have been screening you couldn't have been screening he couldn't have been screening we couldn't have been screening you couldn't have been screening they couldn't have been screening
Forma interrogativa
Forma simple
could I screen? could you screen? could he screen? could we screen? could you screen? could they screen?
Forma com V-ing
could I be screening? could you be screening? could he be screening? could we be screening? could you be screening? could they be screening?
Perfeito
could I have screened? could you have screened? could he have screened? could we have screened? could you have screened? could they have screened?
Perfeito com V-ing
could I have been screening? could you have been screening? could he have been screening? could we have been screening? could you have been screening? could they have been screening?
Forma interro-Negação
Forma simple
couldn't I screen? couldn't you screen? couldn't he screen? couldn't we screen? couldn't you screen? couldn't they screen?
Forma com V-ing
couldn't I be screening? couldn't you be screening? couldn't he be screening? couldn't we be screening? couldn't you be screening? couldn't they be screening?
Perfeito
couldn't I have screened? couldn't you have screened? couldn't he have screened? couldn't we have screened? couldn't you have screened? couldn't they have screened?
Perfeito com V-ing
couldn't I have been screening? couldn't you have been screening? couldn't he have been screening? couldn't we have been screening? couldn't you have been screening? couldn't they have been screening?