must grandstand
Regular verb: grandstand - grandstanded- grandstanded

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must grandstand
you must grandstand
he must grandstand
we must grandstand
you must grandstand
they must grandstand 	I must be grandstanding
you must be grandstanding
he must be grandstanding
we must be grandstanding
you must be grandstanding
they must be grandstanding	I must have grandstanded
you must have grandstanded
he must have grandstanded
we must have grandstanded
you must have grandstanded
they must have grandstanded	I must have been grandstanding
you must have been grandstanding
he must have been grandstanding
we must have been grandstanding
you must have been grandstanding
they must have been grandstanding	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't grandstand
you mustn't grandstand
he mustn't grandstand
we mustn't grandstand
you mustn't grandstand
they mustn't grandstand 	I mustn't be grandstanding
you mustn't be grandstanding
he mustn't be grandstanding
we mustn't be grandstanding
you mustn't be grandstanding
they mustn't be grandstanding	I mustn't have grandstanded
you mustn't have grandstanded
he mustn't have grandstanded
we mustn't have grandstanded
you mustn't have grandstanded
they mustn't have grandstanded	I mustn't have been grandstanding
you mustn't have been grandstanding
he mustn't have been grandstanding
we mustn't have been grandstanding
you mustn't have been grandstanding
they mustn't have been grandstanding	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I grandstand?
must you grandstand?
must he grandstand?
must we grandstand?
must you grandstand?
must they grandstand? 	must I be grandstanding?
must you be grandstanding?
must he be grandstanding?
must we be grandstanding?
must you be grandstanding?
must they be grandstanding? 	must I have grandstanded?
must you have grandstanded?
must he have grandstanded?
must we have grandstanded?
must you have grandstanded?
must they have grandstanded? 	must I have been grandstanding?
must you have been grandstanding?
must he have been grandstanding?
must we have been grandstanding?
must you have been grandstanding?
must they have been grandstanding? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I grandstand?
mustn't you grandstand?
mustn't he grandstand?
mustn't we grandstand?
mustn't you grandstand?
mustn't they grandstand? 	mustn't I be grandstanding?
mustn't you be grandstanding?
mustn't he be grandstanding?
mustn't we be grandstanding?
mustn't you be grandstanding?
mustn't they be grandstanding? 	mustn't I have grandstanded?
mustn't you have grandstanded?
mustn't he have grandstanded?
mustn't we have grandstanded?
mustn't you have grandstanded?
mustn't they have grandstanded? 	mustn't I have been grandstanding?
mustn't you have been grandstanding?
mustn't he have been grandstanding?
mustn't we have been grandstanding?
mustn't you have been grandstanding?
mustn't they have been grandstanding?