must gem
Regular verb: gem - gemed- gemed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must gem
you must gem
she must gem
we must gem
you must gem
they must gem 	I must be geming
you must be geming
she must be geming
we must be geming
you must be geming
they must be geming	I must have gemed
you must have gemed
she must have gemed
we must have gemed
you must have gemed
they must have gemed	I must have been geming
you must have been geming
she must have been geming
we must have been geming
you must have been geming
they must have been geming	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't gem
you mustn't gem
she mustn't gem
we mustn't gem
you mustn't gem
they mustn't gem 	I mustn't be geming
you mustn't be geming
she mustn't be geming
we mustn't be geming
you mustn't be geming
they mustn't be geming	I mustn't have gemed
you mustn't have gemed
she mustn't have gemed
we mustn't have gemed
you mustn't have gemed
they mustn't have gemed	I mustn't have been geming
you mustn't have been geming
she mustn't have been geming
we mustn't have been geming
you mustn't have been geming
they mustn't have been geming	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I gem?
must you gem?
must she gem?
must we gem?
must you gem?
must they gem? 	must I be geming?
must you be geming?
must she be geming?
must we be geming?
must you be geming?
must they be geming? 	must I have gemed?
must you have gemed?
must she have gemed?
must we have gemed?
must you have gemed?
must they have gemed? 	must I have been geming?
must you have been geming?
must she have been geming?
must we have been geming?
must you have been geming?
must they have been geming? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I gem?
mustn't you gem?
mustn't she gem?
mustn't we gem?
mustn't you gem?
mustn't they gem? 	mustn't I be geming?
mustn't you be geming?
mustn't she be geming?
mustn't we be geming?
mustn't you be geming?
mustn't they be geming? 	mustn't I have gemed?
mustn't you have gemed?
mustn't she have gemed?
mustn't we have gemed?
mustn't you have gemed?
mustn't they have gemed? 	mustn't I have been geming?
mustn't you have been geming?
mustn't she have been geming?
mustn't we have been geming?
mustn't you have been geming?
mustn't they have been geming?