must yacht
Regular verb: yacht - yachted- yachted

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must yacht
you must yacht
he must yacht
we must yacht
you must yacht
they must yacht 	I must be yachting
you must be yachting
he must be yachting
we must be yachting
you must be yachting
they must be yachting	I must have yachted
you must have yachted
he must have yachted
we must have yachted
you must have yachted
they must have yachted	I must have been yachting
you must have been yachting
he must have been yachting
we must have been yachting
you must have been yachting
they must have been yachting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't yacht
you mustn't yacht
he mustn't yacht
we mustn't yacht
you mustn't yacht
they mustn't yacht 	I mustn't be yachting
you mustn't be yachting
he mustn't be yachting
we mustn't be yachting
you mustn't be yachting
they mustn't be yachting	I mustn't have yachted
you mustn't have yachted
he mustn't have yachted
we mustn't have yachted
you mustn't have yachted
they mustn't have yachted	I mustn't have been yachting
you mustn't have been yachting
he mustn't have been yachting
we mustn't have been yachting
you mustn't have been yachting
they mustn't have been yachting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I yacht?
must you yacht?
must he yacht?
must we yacht?
must you yacht?
must they yacht? 	must I be yachting?
must you be yachting?
must he be yachting?
must we be yachting?
must you be yachting?
must they be yachting? 	must I have yachted?
must you have yachted?
must he have yachted?
must we have yachted?
must you have yachted?
must they have yachted? 	must I have been yachting?
must you have been yachting?
must he have been yachting?
must we have been yachting?
must you have been yachting?
must they have been yachting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I yacht?
mustn't you yacht?
mustn't he yacht?
mustn't we yacht?
mustn't you yacht?
mustn't they yacht? 	mustn't I be yachting?
mustn't you be yachting?
mustn't he be yachting?
mustn't we be yachting?
mustn't you be yachting?
mustn't they be yachting? 	mustn't I have yachted?
mustn't you have yachted?
mustn't he have yachted?
mustn't we have yachted?
mustn't you have yachted?
mustn't they have yachted? 	mustn't I have been yachting?
mustn't you have been yachting?
mustn't he have been yachting?
mustn't we have been yachting?
mustn't you have been yachting?
mustn't they have been yachting?