Conjugación del verbo inglés
COULD SCREEN

Verbo regular: screen - screened - screened

Afirmación

Forma simple	Forma con V-ing
I could screen you could screen she could screen we could screen you could screen they could screen	I could be screening you could be screening she could be screening we could be screening you could be screening they could be screening
Perfecto	Perfecto con V-ing
I could have screened you could have screened she could have screened we could have screened you could have screened they could have screened	I could have been screening you could have been screening she could have been screening we could have been screening you could have been screening they could have been screening

Negación

Forma simple	Forma con V-ing
I couldn't screen you couldn't screen she couldn't screen we couldn't screen you couldn't screen they couldn't screen	I couldn't be screening you couldn't be screening she couldn't be screening we couldn't be screening you couldn't be screening they couldn't be screening
Perfecto	Perfecto con V-ing
I couldn't have screened you couldn't have screened she couldn't have screened we couldn't have screened you couldn't have screened they couldn't have screened	I couldn't have been screening you couldn't have been screening she 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	Forma con V-ing
could I screen? could you screen? could she screen? could we screen? could you screen? could they screen?	could I be screening? could you be screening? could she be screening? could we be screening? could you be screening? could they be screening?
Perfecto	Perfecto con V-ing
could I have screened? could you have screened? could she have screened? could we have screened? could you have screened? could they have screened?	could I have been screening? could you have been screening? could she have been screening? could we have been screening? could you have been screening? could they have been screening?

Forma interro-negativa

Forma simple	Forma con V-ing
couldn't I screen? couldn't you screen? couldn't she screen? couldn't we screen? couldn't you screen? couldn't they screen?	couldn't I be screening? couldn't you be screening? couldn't she be screening? couldn't we be screening? couldn't you be screening? couldn't they be screening?
Perfecto	Perfecto con V-ing
couldn't I have screened? couldn't you have screened? couldn't she have screened? couldn't we have screened? couldn't you have screened? couldn't they have screened?	couldn't I have been screening? couldn't you have been screening? couldn't she have been screening? couldn't we have been screening? couldn't you have been screening? couldn't they have been screening?