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 must not yacht
you must not yacht
he must not yacht
we must not yacht
you must not yacht
they must not yacht 	I must not be yachting
you must not be yachting
he must not be yachting
we must not be yachting
you must not be yachting
they must not be yachting	I must not have yachted
you must not have yachted
he must not have yachted
we must not have yachted
you must not have yachted
they must not have yachted	I must not have been yachting
you must not have been yachting
he must not have been yachting
we must not have been yachting
you must not have been yachting
they must not 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 	
must I not yacht?
must you not yacht?
must he not yacht?
must we not yacht?
must you not yacht?
must they not yacht? 	must I not be yachting?
must you not be yachting?
must he not be yachting?
must we not be yachting?
must you not be yachting?
must they not be yachting? 	must I not have yachted?
must you not have yachted?
must he not have yachted?
must we not have yachted?
must you not have yachted?
must they not have yachted? 	must I not have been yachting?
must you not have been yachting?
must he not have been yachting?
must we not have been yachting?
must you not have been yachting?
must they not have been yachting?