must gambol
Regular verb: gambol - gamboled- gamboled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must gambol
you must gambol
she must gambol
we must gambol
you must gambol
they must gambol 	I must be gamboling
you must be gamboling
she must be gamboling
we must be gamboling
you must be gamboling
they must be gamboling	I must have gamboled
you must have gamboled
she must have gamboled
we must have gamboled
you must have gamboled
they must have gamboled	I must have been gamboling
you must have been gamboling
she must have been gamboling
we must have been gamboling
you must have been gamboling
they must have been gamboling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't gambol
you mustn't gambol
she mustn't gambol
we mustn't gambol
you mustn't gambol
they mustn't gambol 	I mustn't be gamboling
you mustn't be gamboling
she mustn't be gamboling
we mustn't be gamboling
you mustn't be gamboling
they mustn't be gamboling	I mustn't have gamboled
you mustn't have gamboled
she mustn't have gamboled
we mustn't have gamboled
you mustn't have gamboled
they mustn't have gamboled	I mustn't have been gamboling
you mustn't have been gamboling
she mustn't have been gamboling
we mustn't have been gamboling
you mustn't have been gamboling
they mustn't have been gamboling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I gambol?
must you gambol?
must she gambol?
must we gambol?
must you gambol?
must they gambol? 	must I be gamboling?
must you be gamboling?
must she be gamboling?
must we be gamboling?
must you be gamboling?
must they be gamboling? 	must I have gamboled?
must you have gamboled?
must she have gamboled?
must we have gamboled?
must you have gamboled?
must they have gamboled? 	must I have been gamboling?
must you have been gamboling?
must she have been gamboling?
must we have been gamboling?
must you have been gamboling?
must they have been gamboling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I gambol?
mustn't you gambol?
mustn't she gambol?
mustn't we gambol?
mustn't you gambol?
mustn't they gambol? 	mustn't I be gamboling?
mustn't you be gamboling?
mustn't she be gamboling?
mustn't we be gamboling?
mustn't you be gamboling?
mustn't they be gamboling? 	mustn't I have gamboled?
mustn't you have gamboled?
mustn't she have gamboled?
mustn't we have gamboled?
mustn't you have gamboled?
mustn't they have gamboled? 	mustn't I have been gamboling?
mustn't you have been gamboling?
mustn't she have been gamboling?
mustn't we have been gamboling?
mustn't you have been gamboling?
mustn't they have been gamboling?