must naturalise
Regular verb: naturalise - naturalised- naturalised

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must naturalise
you must naturalise
she must naturalise
we must naturalise
you must naturalise
they must naturalise 	I must be naturalising
you must be naturalising
she must be naturalising
we must be naturalising
you must be naturalising
they must be naturalising	I must have naturalised
you must have naturalised
she must have naturalised
we must have naturalised
you must have naturalised
they must have naturalised	I must have been naturalising
you must have been naturalising
she must have been naturalising
we must have been naturalising
you must have been naturalising
they must have been naturalising	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't naturalise
you mustn't naturalise
she mustn't naturalise
we mustn't naturalise
you mustn't naturalise
they mustn't naturalise 	I mustn't be naturalising
you mustn't be naturalising
she mustn't be naturalising
we mustn't be naturalising
you mustn't be naturalising
they mustn't be naturalising	I mustn't have naturalised
you mustn't have naturalised
she mustn't have naturalised
we mustn't have naturalised
you mustn't have naturalised
they mustn't have naturalised	I mustn't have been naturalising
you mustn't have been naturalising
she mustn't have been naturalising
we mustn't have been naturalising
you mustn't have been naturalising
they mustn't have been naturalising	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I naturalise?
must you naturalise?
must she naturalise?
must we naturalise?
must you naturalise?
must they naturalise? 	must I be naturalising?
must you be naturalising?
must she be naturalising?
must we be naturalising?
must you be naturalising?
must they be naturalising? 	must I have naturalised?
must you have naturalised?
must she have naturalised?
must we have naturalised?
must you have naturalised?
must they have naturalised? 	must I have been naturalising?
must you have been naturalising?
must she have been naturalising?
must we have been naturalising?
must you have been naturalising?
must they have been naturalising? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I naturalise?
mustn't you naturalise?
mustn't she naturalise?
mustn't we naturalise?
mustn't you naturalise?
mustn't they naturalise? 	mustn't I be naturalising?
mustn't you be naturalising?
mustn't she be naturalising?
mustn't we be naturalising?
mustn't you be naturalising?
mustn't they be naturalising? 	mustn't I have naturalised?
mustn't you have naturalised?
mustn't she have naturalised?
mustn't we have naturalised?
mustn't you have naturalised?
mustn't they have naturalised? 	mustn't I have been naturalising?
mustn't you have been naturalising?
mustn't she have been naturalising?
mustn't we have been naturalising?
mustn't you have been naturalising?
mustn't they have been naturalising?