must protect
Regular verb: protect - protected- protected

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must protect
you must protect
he must protect
we must protect
you must protect
they must protect 	I must be protecting
you must be protecting
he must be protecting
we must be protecting
you must be protecting
they must be protecting	I must have protected
you must have protected
he must have protected
we must have protected
you must have protected
they must have protected	I must have been protecting
you must have been protecting
he must have been protecting
we must have been protecting
you must have been protecting
they must have been protecting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't protect
you mustn't protect
he mustn't protect
we mustn't protect
you mustn't protect
they mustn't protect 	I mustn't be protecting
you mustn't be protecting
he mustn't be protecting
we mustn't be protecting
you mustn't be protecting
they mustn't be protecting	I mustn't have protected
you mustn't have protected
he mustn't have protected
we mustn't have protected
you mustn't have protected
they mustn't have protected	I mustn't have been protecting
you mustn't have been protecting
he mustn't have been protecting
we mustn't have been protecting
you mustn't have been protecting
they mustn't have been protecting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I protect?
must you protect?
must he protect?
must we protect?
must you protect?
must they protect? 	must I be protecting?
must you be protecting?
must he be protecting?
must we be protecting?
must you be protecting?
must they be protecting? 	must I have protected?
must you have protected?
must he have protected?
must we have protected?
must you have protected?
must they have protected? 	must I have been protecting?
must you have been protecting?
must he have been protecting?
must we have been protecting?
must you have been protecting?
must they have been protecting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I protect?
mustn't you protect?
mustn't he protect?
mustn't we protect?
mustn't you protect?
mustn't they protect? 	mustn't I be protecting?
mustn't you be protecting?
mustn't he be protecting?
mustn't we be protecting?
mustn't you be protecting?
mustn't they be protecting? 	mustn't I have protected?
mustn't you have protected?
mustn't he have protected?
mustn't we have protected?
mustn't you have protected?
mustn't they have protected? 	mustn't I have been protecting?
mustn't you have been protecting?
mustn't he have been protecting?
mustn't we have been protecting?
mustn't you have been protecting?
mustn't they have been protecting?