I must pin you must pin he must pin we must pin you must pin they must pin
V-ing form
I must be pinning you must be pinning he must be pinning we must be pinning you must be pinning they must be pinning
Perfect
I must have pinned you must have pinned he must have pinned we must have pinned you must have pinned they must have pinned
V-ing perfect
I must have been pinning you must have been pinning he must have been pinning we must have been pinning you must have been pinning they must have been pinning
Negation
Simple form
I mustn't pin you mustn't pin he mustn't pin we mustn't pin you mustn't pin they mustn't pin
V-ing form
I mustn't be pinning you mustn't be pinning he mustn't be pinning we mustn't be pinning you mustn't be pinning they mustn't be pinning
Perfect
I mustn't have pinned you mustn't have pinned he mustn't have pinned we mustn't have pinned you mustn't have pinned they mustn't have pinned
V-ing perfect
I mustn't have been pinning you mustn't have been pinning he mustn't have been pinning we mustn't have been pinning you mustn't have been pinning they mustn't have been pinning
Interrogative form
Simple form
must I pin? must you pin? must he pin? must we pin? must you pin? must they pin?
V-ing form
must I be pinning? must you be pinning? must he be pinning? must we be pinning? must you be pinning? must they be pinning?
Perfect
must I have pinned? must you have pinned? must he have pinned? must we have pinned? must you have pinned? must they have pinned?
V-ing perfect
must I have been pinning? must you have been pinning? must he have been pinning? must we have been pinning? must you have been pinning? must they have been pinning?
Interro-negative form
Simple form
mustn't I pin? mustn't you pin? mustn't he pin? mustn't we pin? mustn't you pin? mustn't they pin?
V-ing form
mustn't I be pinning? mustn't you be pinning? mustn't he be pinning? mustn't we be pinning? mustn't you be pinning? mustn't they be pinning?
Perfect
mustn't I have pinned? mustn't you have pinned? mustn't he have pinned? mustn't we have pinned? mustn't you have pinned? mustn't they have pinned?
V-ing perfect
mustn't I have been pinning? mustn't you have been pinning? mustn't he have been pinning? mustn't we have been pinning? mustn't you have been pinning? mustn't they have been pinning?