must open
Verbo regolare: open - opened- opened

Affermazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I must open
you must open
he must open
we must open
you must open
they must open 	I must be opening
you must be opening
he must be opening
we must be opening
you must be opening
they must be opening	I must have opened
you must have opened
he must have opened
we must have opened
you must have opened
they must have opened	I must have been opening
you must have been opening
he must have been opening
we must have been opening
you must have been opening
they must have been opening	

Negazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I mustn't open
you mustn't open
he mustn't open
we mustn't open
you mustn't open
they mustn't open 	I mustn't be opening
you mustn't be opening
he mustn't be opening
we mustn't be opening
you mustn't be opening
they mustn't be opening	I mustn't have opened
you mustn't have opened
he mustn't have opened
we mustn't have opened
you mustn't have opened
they mustn't have opened	I mustn't have been opening
you mustn't have been opening
he mustn't have been opening
we mustn't have been opening
you mustn't have been opening
they mustn't have been opening	

Forma interrogativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
must I open?
must you open?
must he open?
must we open?
must you open?
must they open? 	must I be opening?
must you be opening?
must he be opening?
must we be opening?
must you be opening?
must they be opening? 	must I have opened?
must you have opened?
must he have opened?
must we have opened?
must you have opened?
must they have opened? 	must I have been opening?
must you have been opening?
must he have been opening?
must we have been opening?
must you have been opening?
must they have been opening? 	

Forma interro-negativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
mustn't I open?
mustn't you open?
mustn't he open?
mustn't we open?
mustn't you open?
mustn't they open? 	mustn't I be opening?
mustn't you be opening?
mustn't he be opening?
mustn't we be opening?
mustn't you be opening?
mustn't they be opening? 	mustn't I have opened?
mustn't you have opened?
mustn't he have opened?
mustn't we have opened?
mustn't you have opened?
mustn't they have opened? 	mustn't I have been opening?
mustn't you have been opening?
mustn't he have been opening?
mustn't we have been opening?
mustn't you have been opening?
mustn't they have been opening?