must interface
Verbo regular: interface - interfaced- interfaced

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must interface
you must interface
he must interface
we must interface
you must interface
they must interface 	I must be interfacing
you must be interfacing
he must be interfacing
we must be interfacing
you must be interfacing
they must be interfacing	I must have interfaced
you must have interfaced
he must have interfaced
we must have interfaced
you must have interfaced
they must have interfaced	I must have been interfacing
you must have been interfacing
he must have been interfacing
we must have been interfacing
you must have been interfacing
they must have been interfacing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not interface
you must not interface
he must not interface
we must not interface
you must not interface
they must not interface 	I must not be interfacing
you must not be interfacing
he must not be interfacing
we must not be interfacing
you must not be interfacing
they must not be interfacing	I must not have interfaced
you must not have interfaced
he must not have interfaced
we must not have interfaced
you must not have interfaced
they must not have interfaced	I must not have been interfacing
you must not have been interfacing
he must not have been interfacing
we must not have been interfacing
you must not have been interfacing
they must not have been interfacing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I interface?
must you interface?
must he interface?
must we interface?
must you interface?
must they interface? 	must I be interfacing?
must you be interfacing?
must he be interfacing?
must we be interfacing?
must you be interfacing?
must they be interfacing? 	must I have interfaced?
must you have interfaced?
must he have interfaced?
must we have interfaced?
must you have interfaced?
must they have interfaced? 	must I have been interfacing?
must you have been interfacing?
must he have been interfacing?
must we have been interfacing?
must you have been interfacing?
must they have been interfacing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not interface?
must you not interface?
must he not interface?
must we not interface?
must you not interface?
must they not interface? 	must I not be interfacing?
must you not be interfacing?
must he not be interfacing?
must we not be interfacing?
must you not be interfacing?
must they not be interfacing? 	must I not have interfaced?
must you not have interfaced?
must he not have interfaced?
must we not have interfaced?
must you not have interfaced?
must they not have interfaced? 	must I not have been interfacing?
must you not have been interfacing?
must he not have been interfacing?
must we not have been interfacing?
must you not have been interfacing?
must they not have been interfacing?