must dematerialise
Regular verb: dematerialise - dematerialised- dematerialised

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must dematerialise
you must dematerialise
he must dematerialise
we must dematerialise
you must dematerialise
they must dematerialise 	I must be dematerialising
you must be dematerialising
he must be dematerialising
we must be dematerialising
you must be dematerialising
they must be dematerialising	I must have dematerialised
you must have dematerialised
he must have dematerialised
we must have dematerialised
you must have dematerialised
they must have dematerialised	I must have been dematerialising
you must have been dematerialising
he must have been dematerialising
we must have been dematerialising
you must have been dematerialising
they must have been dematerialising	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not dematerialise
you must not dematerialise
he must not dematerialise
we must not dematerialise
you must not dematerialise
they must not dematerialise 	I must not be dematerialising
you must not be dematerialising
he must not be dematerialising
we must not be dematerialising
you must not be dematerialising
they must not be dematerialising	I must not have dematerialised
you must not have dematerialised
he must not have dematerialised
we must not have dematerialised
you must not have dematerialised
they must not have dematerialised	I must not have been dematerialising
you must not have been dematerialising
he must not have been dematerialising
we must not have been dematerialising
you must not have been dematerialising
they must not have been dematerialising	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I dematerialise?
must you dematerialise?
must he dematerialise?
must we dematerialise?
must you dematerialise?
must they dematerialise? 	must I be dematerialising?
must you be dematerialising?
must he be dematerialising?
must we be dematerialising?
must you be dematerialising?
must they be dematerialising? 	must I have dematerialised?
must you have dematerialised?
must he have dematerialised?
must we have dematerialised?
must you have dematerialised?
must they have dematerialised? 	must I have been dematerialising?
must you have been dematerialising?
must he have been dematerialising?
must we have been dematerialising?
must you have been dematerialising?
must they have been dematerialising? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not dematerialise?
must you not dematerialise?
must he not dematerialise?
must we not dematerialise?
must you not dematerialise?
must they not dematerialise? 	must I not be dematerialising?
must you not be dematerialising?
must he not be dematerialising?
must we not be dematerialising?
must you not be dematerialising?
must they not be dematerialising? 	must I not have dematerialised?
must you not have dematerialised?
must he not have dematerialised?
must we not have dematerialised?
must you not have dematerialised?
must they not have dematerialised? 	must I not have been dematerialising?
must you not have been dematerialising?
must he not have been dematerialising?
must we not have been dematerialising?
must you not have been dematerialising?
must they not have been dematerialising?