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
she must open
we must open
you must open
they must open 	I must be opening
you must be opening
she must be opening
we must be opening
you must be opening
they must be opening	I must have opened
you must have opened
she 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
she 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
she 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
she 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
she 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
she 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 she open?
must we open?
must you open?
must they open? 	must I be opening?
must you be opening?
must she be opening?
must we be opening?
must you be opening?
must they be opening? 	must I have opened?
must you have opened?
must she 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 she 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 she 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 she 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 she 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 she have been opening?
mustn't we have been opening?
mustn't you have been opening?
mustn't they have been opening?