must sunbathe
Regular verb: sunbathe - sunbathed- sunbathed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must sunbathe
you must sunbathe
she must sunbathe
we must sunbathe
you must sunbathe
they must sunbathe 	I must be sunbathing
you must be sunbathing
she must be sunbathing
we must be sunbathing
you must be sunbathing
they must be sunbathing	I must have sunbathed
you must have sunbathed
she must have sunbathed
we must have sunbathed
you must have sunbathed
they must have sunbathed	I must have been sunbathing
you must have been sunbathing
she must have been sunbathing
we must have been sunbathing
you must have been sunbathing
they must have been sunbathing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't sunbathe
you mustn't sunbathe
she mustn't sunbathe
we mustn't sunbathe
you mustn't sunbathe
they mustn't sunbathe 	I mustn't be sunbathing
you mustn't be sunbathing
she mustn't be sunbathing
we mustn't be sunbathing
you mustn't be sunbathing
they mustn't be sunbathing	I mustn't have sunbathed
you mustn't have sunbathed
she mustn't have sunbathed
we mustn't have sunbathed
you mustn't have sunbathed
they mustn't have sunbathed	I mustn't have been sunbathing
you mustn't have been sunbathing
she mustn't have been sunbathing
we mustn't have been sunbathing
you mustn't have been sunbathing
they mustn't have been sunbathing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I sunbathe?
must you sunbathe?
must she sunbathe?
must we sunbathe?
must you sunbathe?
must they sunbathe? 	must I be sunbathing?
must you be sunbathing?
must she be sunbathing?
must we be sunbathing?
must you be sunbathing?
must they be sunbathing? 	must I have sunbathed?
must you have sunbathed?
must she have sunbathed?
must we have sunbathed?
must you have sunbathed?
must they have sunbathed? 	must I have been sunbathing?
must you have been sunbathing?
must she have been sunbathing?
must we have been sunbathing?
must you have been sunbathing?
must they have been sunbathing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I sunbathe?
mustn't you sunbathe?
mustn't she sunbathe?
mustn't we sunbathe?
mustn't you sunbathe?
mustn't they sunbathe? 	mustn't I be sunbathing?
mustn't you be sunbathing?
mustn't she be sunbathing?
mustn't we be sunbathing?
mustn't you be sunbathing?
mustn't they be sunbathing? 	mustn't I have sunbathed?
mustn't you have sunbathed?
mustn't she have sunbathed?
mustn't we have sunbathed?
mustn't you have sunbathed?
mustn't they have sunbathed? 	mustn't I have been sunbathing?
mustn't you have been sunbathing?
mustn't she have been sunbathing?
mustn't we have been sunbathing?
mustn't you have been sunbathing?
mustn't they have been sunbathing?