must kayak
Regular verb: kayak - kayaked- kayaked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must kayak
you must kayak
she must kayak
we must kayak
you must kayak
they must kayak 	I must be kayaking
you must be kayaking
she must be kayaking
we must be kayaking
you must be kayaking
they must be kayaking	I must have kayaked
you must have kayaked
she must have kayaked
we must have kayaked
you must have kayaked
they must have kayaked	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 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't kayak
you mustn't kayak
she mustn't kayak
we mustn't kayak
you mustn't kayak
they mustn't kayak 	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	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	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 	V-ing form 	Perfect 	V-ing perfect 	
must I kayak?
must you kayak?
must she kayak?
must we kayak?
must you kayak?
must they kayak? 	must I be kayaking?
must you be kayaking?
must she be kayaking?
must we be kayaking?
must you be kayaking?
must they be kayaking? 	must I have kayaked?
must you have kayaked?
must she have kayaked?
must we have kayaked?
must you have kayaked?
must they have kayaked? 	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 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I kayak?
mustn't you kayak?
mustn't she kayak?
mustn't we kayak?
mustn't you kayak?
mustn't they kayak? 	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? 	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? 	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?