could screen
Verbo regolare: screen - screened- screened

Affermazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto 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	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	

Negazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I could not screen
you could not screen
she could not screen
we could not screen
you could not screen
they could not screen 	I could not be screening
you could not be screening
she could not be screening
we could not be screening
you could not be screening
they could not be screening	I could not have screened
you could not have screened
she could not have screened
we could not have screened
you could not have screened
they could not have screened	I could not have been screening
you could not have been screening
she could not have been screening
we could not have been screening
you could not have been screening
they could not have been screening	

Forma interrogativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto 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? 	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 semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
could I not screen?
could you not screen?
could she not screen?
could we not screen?
could you not screen?
could they not screen? 	could I not be screening?
could you not be screening?
could she not be screening?
could we not be screening?
could you not be screening?
could they not be screening? 	could I not have screened?
could you not have screened?
could she not have screened?
could we not have screened?
could you not have screened?
could they not have screened? 	could I not have been screening?
could you not have been screening?
could she not have been screening?
could we not have been screening?
could you not have been screening?
could they not have been screening?