must inter
Regular verb: inter - interred- interred

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must inter
you must inter
he must inter
we must inter
you must inter
they must inter 	I must be interring
you must be interring
he must be interring
we must be interring
you must be interring
they must be interring	I must have interred
you must have interred
he must have interred
we must have interred
you must have interred
they must have interred	I must have been interring
you must have been interring
he must have been interring
we must have been interring
you must have been interring
they must have been interring	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't inter
you mustn't inter
he mustn't inter
we mustn't inter
you mustn't inter
they mustn't inter 	I mustn't be interring
you mustn't be interring
he mustn't be interring
we mustn't be interring
you mustn't be interring
they mustn't be interring	I mustn't have interred
you mustn't have interred
he mustn't have interred
we mustn't have interred
you mustn't have interred
they mustn't have interred	I mustn't have been interring
you mustn't have been interring
he mustn't have been interring
we mustn't have been interring
you mustn't have been interring
they mustn't have been interring	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I inter?
must you inter?
must he inter?
must we inter?
must you inter?
must they inter? 	must I be interring?
must you be interring?
must he be interring?
must we be interring?
must you be interring?
must they be interring? 	must I have interred?
must you have interred?
must he have interred?
must we have interred?
must you have interred?
must they have interred? 	must I have been interring?
must you have been interring?
must he have been interring?
must we have been interring?
must you have been interring?
must they have been interring? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I inter?
mustn't you inter?
mustn't he inter?
mustn't we inter?
mustn't you inter?
mustn't they inter? 	mustn't I be interring?
mustn't you be interring?
mustn't he be interring?
mustn't we be interring?
mustn't you be interring?
mustn't they be interring? 	mustn't I have interred?
mustn't you have interred?
mustn't he have interred?
mustn't we have interred?
mustn't you have interred?
mustn't they have interred? 	mustn't I have been interring?
mustn't you have been interring?
mustn't he have been interring?
mustn't we have been interring?
mustn't you have been interring?
mustn't they have been interring?