must open
Regelmä&szlig;iges Verb: open - opened- opened

Bestätigung 	
Einfache Form 	Form mit V-ing 	Perfekt 	Perfekt mit 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	

Negation 	
Einfache Form 	Form mit V-ing 	Perfekt 	Perfekt mit V-ing 	
I must not open
you must not open
he must not open
we must not open
you must not open
they must not open 	I must not be opening
you must not be opening
he must not be opening
we must not be opening
you must not be opening
they must not be opening	I must not have opened
you must not have opened
he must not have opened
we must not have opened
you must not have opened
they must not have opened	I must not have been opening
you must not have been opening
he must not have been opening
we must not have been opening
you must not have been opening
they must not have been opening	

Fragende Form 	
Einfache Form 	Form mit V-ing 	Perfekt 	Perfekt mit 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? 	

Fragende Negation Form 	
Einfache Form 	Form mit V-ing 	Perfekt 	Perfekt mit V-ing 	
must I not open?
must you not open?
must he not open?
must we not open?
must you not open?
must they not open? 	must I not be opening?
must you not be opening?
must he not be opening?
must we not be opening?
must you not be opening?
must they not be opening? 	must I not have opened?
must you not have opened?
must he not have opened?
must we not have opened?
must you not have opened?
must they not have opened? 	must I not have been opening?
must you not have been opening?
must he not have been opening?
must we not have been opening?
must you not have been opening?
must they not have been opening?