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 mustn't interface
you mustn't interface
he mustn't interface
we mustn't interface
you mustn't interface
they mustn't interface 	I mustn't be interfacing
you mustn't be interfacing
he mustn't be interfacing
we mustn't be interfacing
you mustn't be interfacing
they mustn't be interfacing	I mustn't have interfaced
you mustn't have interfaced
he mustn't have interfaced
we mustn't have interfaced
you mustn't have interfaced
they mustn't have interfaced	I mustn't have been interfacing
you mustn't have been interfacing
he mustn't have been interfacing
we mustn't have been interfacing
you mustn't have been interfacing
they mustn't 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 	
mustn't I interface?
mustn't you interface?
mustn't he interface?
mustn't we interface?
mustn't you interface?
mustn't they interface? 	mustn't I be interfacing?
mustn't you be interfacing?
mustn't he be interfacing?
mustn't we be interfacing?
mustn't you be interfacing?
mustn't they be interfacing? 	mustn't I have interfaced?
mustn't you have interfaced?
mustn't he have interfaced?
mustn't we have interfaced?
mustn't you have interfaced?
mustn't they have interfaced? 	mustn't I have been interfacing?
mustn't you have been interfacing?
mustn't he have been interfacing?
mustn't we have been interfacing?
mustn't you have been interfacing?
mustn't they have been interfacing?