must extemporize
Regular verb: extemporize - extemporized- extemporized

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must extemporize
you must extemporize
he must extemporize
we must extemporize
you must extemporize
they must extemporize 	I must be extemporizing
you must be extemporizing
he must be extemporizing
we must be extemporizing
you must be extemporizing
they must be extemporizing	I must have extemporized
you must have extemporized
he must have extemporized
we must have extemporized
you must have extemporized
they must have extemporized	I must have been extemporizing
you must have been extemporizing
he must have been extemporizing
we must have been extemporizing
you must have been extemporizing
they must have been extemporizing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't extemporize
you mustn't extemporize
he mustn't extemporize
we mustn't extemporize
you mustn't extemporize
they mustn't extemporize 	I mustn't be extemporizing
you mustn't be extemporizing
he mustn't be extemporizing
we mustn't be extemporizing
you mustn't be extemporizing
they mustn't be extemporizing	I mustn't have extemporized
you mustn't have extemporized
he mustn't have extemporized
we mustn't have extemporized
you mustn't have extemporized
they mustn't have extemporized	I mustn't have been extemporizing
you mustn't have been extemporizing
he mustn't have been extemporizing
we mustn't have been extemporizing
you mustn't have been extemporizing
they mustn't have been extemporizing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I extemporize?
must you extemporize?
must he extemporize?
must we extemporize?
must you extemporize?
must they extemporize? 	must I be extemporizing?
must you be extemporizing?
must he be extemporizing?
must we be extemporizing?
must you be extemporizing?
must they be extemporizing? 	must I have extemporized?
must you have extemporized?
must he have extemporized?
must we have extemporized?
must you have extemporized?
must they have extemporized? 	must I have been extemporizing?
must you have been extemporizing?
must he have been extemporizing?
must we have been extemporizing?
must you have been extemporizing?
must they have been extemporizing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I extemporize?
mustn't you extemporize?
mustn't he extemporize?
mustn't we extemporize?
mustn't you extemporize?
mustn't they extemporize? 	mustn't I be extemporizing?
mustn't you be extemporizing?
mustn't he be extemporizing?
mustn't we be extemporizing?
mustn't you be extemporizing?
mustn't they be extemporizing? 	mustn't I have extemporized?
mustn't you have extemporized?
mustn't he have extemporized?
mustn't we have extemporized?
mustn't you have extemporized?
mustn't they have extemporized? 	mustn't I have been extemporizing?
mustn't you have been extemporizing?
mustn't he have been extemporizing?
mustn't we have been extemporizing?
mustn't you have been extemporizing?
mustn't they have been extemporizing?