English verb conjugation
MUST INTERN

Regular verb: intern - interned - interned

Affirmation

Simple form	V-ing form
I must intern you must intern he must intern we must intern you must intern they must intern	I must be interning you must be interning he must be interning we must be interning you must be interning they must be interning
Perfect	V-ing perfect
I must have interned you must have interned he must have interned we must have interned you must have interned they must have interned	I must have been interning you must have been interning he must have been interning we must have been interning you must have been interning they must have been interning

Negation

Simple form	V-ing form
I mustn't intern you mustn't intern he mustn't intern we mustn't intern you mustn't intern they mustn't intern	I mustn't be interning you mustn't be interning he mustn't be interning we mustn't be interning you mustn't be interning they mustn't be interning
Perfect	V-ing perfect
I mustn't have interned you mustn't have interned he mustn't have interned we mustn't have interned you mustn't have interned they mustn't have interned	I mustn't have been interning you mustn't have been interning he mustn't have been interning we mustn't have been interning you mustn't have been interning they mustn't have been interning

Interrogative form

Simple form	V-ing form
must I intern? must you intern? must he intern? must we intern? must you intern? must they intern?	must I be interning? must you be interning? must he be interning? must we be interning? must you be interning? must they be interning?
Perfect	V-ing perfect
must I have interned? must you have interned? must he have interned? must we have interned? must you have interned? must they have interned?	must I have been interning? must you have been interning? must he have been interning? must we have been interning? must you have been interning? must they have been interning?

Interro-negative form

Simple form	V-ing form
mustn't I intern? mustn't you intern? mustn't he intern? mustn't we intern? mustn't you intern? mustn't they intern?	mustn't I be interning? mustn't you be interning? mustn't he be interning? mustn't we be interning? mustn't you be interning? mustn't they be interning?
Perfect	V-ing perfect
mustn't I have interned? mustn't you have interned? mustn't he have interned? mustn't we have interned? mustn't you have interned? mustn't they have interned?	mustn't I have been interning? mustn't you have been interning? mustn't he have been interning? mustn't we have been interning? mustn't you have been interning? mustn't they have been interning?