must naturalize
Regular verb: naturalize - naturalized- naturalized

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must naturalize
you must naturalize
he must naturalize
we must naturalize
you must naturalize
they must naturalize 	I must be naturalizing
you must be naturalizing
he must be naturalizing
we must be naturalizing
you must be naturalizing
they must be naturalizing	I must have naturalized
you must have naturalized
he must have naturalized
we must have naturalized
you must have naturalized
they must have naturalized	I must have been naturalizing
you must have been naturalizing
he must have been naturalizing
we must have been naturalizing
you must have been naturalizing
they must have been naturalizing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not naturalize
you must not naturalize
he must not naturalize
we must not naturalize
you must not naturalize
they must not naturalize 	I must not be naturalizing
you must not be naturalizing
he must not be naturalizing
we must not be naturalizing
you must not be naturalizing
they must not be naturalizing	I must not have naturalized
you must not have naturalized
he must not have naturalized
we must not have naturalized
you must not have naturalized
they must not have naturalized	I must not have been naturalizing
you must not have been naturalizing
he must not have been naturalizing
we must not have been naturalizing
you must not have been naturalizing
they must not have been naturalizing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I naturalize?
must you naturalize?
must he naturalize?
must we naturalize?
must you naturalize?
must they naturalize? 	must I be naturalizing?
must you be naturalizing?
must he be naturalizing?
must we be naturalizing?
must you be naturalizing?
must they be naturalizing? 	must I have naturalized?
must you have naturalized?
must he have naturalized?
must we have naturalized?
must you have naturalized?
must they have naturalized? 	must I have been naturalizing?
must you have been naturalizing?
must he have been naturalizing?
must we have been naturalizing?
must you have been naturalizing?
must they have been naturalizing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not naturalize?
must you not naturalize?
must he not naturalize?
must we not naturalize?
must you not naturalize?
must they not naturalize? 	must I not be naturalizing?
must you not be naturalizing?
must he not be naturalizing?
must we not be naturalizing?
must you not be naturalizing?
must they not be naturalizing? 	must I not have naturalized?
must you not have naturalized?
must he not have naturalized?
must we not have naturalized?
must you not have naturalized?
must they not have naturalized? 	must I not have been naturalizing?
must you not have been naturalizing?
must he not have been naturalizing?
must we not have been naturalizing?
must you not have been naturalizing?
must they not have been naturalizing?