must theorize
Regular verb: theorize - theorized- theorized

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must theorize
you must theorize
she must theorize
we must theorize
you must theorize
they must theorize 	I must be theorizing
you must be theorizing
she must be theorizing
we must be theorizing
you must be theorizing
they must be theorizing	I must have theorized
you must have theorized
she must have theorized
we must have theorized
you must have theorized
they must have theorized	I must have been theorizing
you must have been theorizing
she must have been theorizing
we must have been theorizing
you must have been theorizing
they must have been theorizing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't theorize
you mustn't theorize
she mustn't theorize
we mustn't theorize
you mustn't theorize
they mustn't theorize 	I mustn't be theorizing
you mustn't be theorizing
she mustn't be theorizing
we mustn't be theorizing
you mustn't be theorizing
they mustn't be theorizing	I mustn't have theorized
you mustn't have theorized
she mustn't have theorized
we mustn't have theorized
you mustn't have theorized
they mustn't have theorized	I mustn't have been theorizing
you mustn't have been theorizing
she mustn't have been theorizing
we mustn't have been theorizing
you mustn't have been theorizing
they mustn't have been theorizing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I theorize?
must you theorize?
must she theorize?
must we theorize?
must you theorize?
must they theorize? 	must I be theorizing?
must you be theorizing?
must she be theorizing?
must we be theorizing?
must you be theorizing?
must they be theorizing? 	must I have theorized?
must you have theorized?
must she have theorized?
must we have theorized?
must you have theorized?
must they have theorized? 	must I have been theorizing?
must you have been theorizing?
must she have been theorizing?
must we have been theorizing?
must you have been theorizing?
must they have been theorizing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I theorize?
mustn't you theorize?
mustn't she theorize?
mustn't we theorize?
mustn't you theorize?
mustn't they theorize? 	mustn't I be theorizing?
mustn't you be theorizing?
mustn't she be theorizing?
mustn't we be theorizing?
mustn't you be theorizing?
mustn't they be theorizing? 	mustn't I have theorized?
mustn't you have theorized?
mustn't she have theorized?
mustn't we have theorized?
mustn't you have theorized?
mustn't they have theorized? 	mustn't I have been theorizing?
mustn't you have been theorizing?
mustn't she have been theorizing?
mustn't we have been theorizing?
mustn't you have been theorizing?
mustn't they have been theorizing?