I must kayak you must kayak she must kayak we must kayak you must kayak they must kayak
V-ing form
I must be kayaking you must be kayaking she must be kayaking we must be kayaking you must be kayaking they must be kayaking
Perfect
I must have kayaked you must have kayaked she must have kayaked we must have kayaked you must have kayaked they must have kayaked
V-ing perfect
I must have been kayaking you must have been kayaking she must have been kayaking we must have been kayaking you must have been kayaking they must have been kayaking
Negation
Simple form
I mustn't kayak you mustn't kayak she mustn't kayak we mustn't kayak you mustn't kayak they mustn't kayak
V-ing form
I mustn't be kayaking you mustn't be kayaking she mustn't be kayaking we mustn't be kayaking you mustn't be kayaking they mustn't be kayaking
Perfect
I mustn't have kayaked you mustn't have kayaked she mustn't have kayaked we mustn't have kayaked you mustn't have kayaked they mustn't have kayaked
V-ing perfect
I mustn't have been kayaking you mustn't have been kayaking she mustn't have been kayaking we mustn't have been kayaking you mustn't have been kayaking they mustn't have been kayaking
Interrogative form
Simple form
must I kayak? must you kayak? must she kayak? must we kayak? must you kayak? must they kayak?
V-ing form
must I be kayaking? must you be kayaking? must she be kayaking? must we be kayaking? must you be kayaking? must they be kayaking?
Perfect
must I have kayaked? must you have kayaked? must she have kayaked? must we have kayaked? must you have kayaked? must they have kayaked?
V-ing perfect
must I have been kayaking? must you have been kayaking? must she have been kayaking? must we have been kayaking? must you have been kayaking? must they have been kayaking?
Interro-negative form
Simple form
mustn't I kayak? mustn't you kayak? mustn't she kayak? mustn't we kayak? mustn't you kayak? mustn't they kayak?
V-ing form
mustn't I be kayaking? mustn't you be kayaking? mustn't she be kayaking? mustn't we be kayaking? mustn't you be kayaking? mustn't they be kayaking?
Perfect
mustn't I have kayaked? mustn't you have kayaked? mustn't she have kayaked? mustn't we have kayaked? mustn't you have kayaked? mustn't they have kayaked?
V-ing perfect
mustn't I have been kayaking? mustn't you have been kayaking? mustn't she have been kayaking? mustn't we have been kayaking? mustn't you have been kayaking? mustn't they have been kayaking?