I must pin you must pin she must pin we must pin you must pin they must pin
V-ing form
I must be pinning you must be pinning she must be pinning we must be pinning you must be pinning they must be pinning
Perfect
I must have pinned you must have pinned she 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 she 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 she 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 she 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 she 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 she 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 she pin? must we pin? must you pin? must they pin?
V-ing form
must I be pinning? must you be pinning? must she be pinning? must we be pinning? must you be pinning? must they be pinning?
Perfect
must I have pinned? must you have pinned? must she 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 she 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 she 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 she 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 she 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 she have been pinning? mustn't we have been pinning? mustn't you have been pinning? mustn't they have been pinning?