must screen
Verbo regular: screen - screened- screened

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

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not screen
you must not screen
she must not screen
we must not screen
you must not screen
they must not screen 	I must not be screening
you must not be screening
she must not be screening
we must not be screening
you must not be screening
they must not be screening	I must not have screened
you must not have screened
she must not have screened
we must not have screened
you must not have screened
they must not have screened	I must not have been screening
you must not have been screening
she must not have been screening
we must not have been screening
you must not have been screening
they must not have been screening	

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

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not screen?
must you not screen?
must she not screen?
must we not screen?
must you not screen?
must they not screen? 	must I not be screening?
must you not be screening?
must she not be screening?
must we not be screening?
must you not be screening?
must they not be screening? 	must I not have screened?
must you not have screened?
must she not have screened?
must we not have screened?
must you not have screened?
must they not have screened? 	must I not have been screening?
must you not have been screening?
must she not have been screening?
must we not have been screening?
must you not have been screening?
must they not have been screening?