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