must devitalise
Regular verb: devitalise - devitalised- devitalised

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must devitalise
you must devitalise
she must devitalise
we must devitalise
you must devitalise
they must devitalise 	I must be devitalising
you must be devitalising
she must be devitalising
we must be devitalising
you must be devitalising
they must be devitalising	I must have devitalised
you must have devitalised
she must have devitalised
we must have devitalised
you must have devitalised
they must have devitalised	I must have been devitalising
you must have been devitalising
she must have been devitalising
we must have been devitalising
you must have been devitalising
they must have been devitalising	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not devitalise
you must not devitalise
she must not devitalise
we must not devitalise
you must not devitalise
they must not devitalise 	I must not be devitalising
you must not be devitalising
she must not be devitalising
we must not be devitalising
you must not be devitalising
they must not be devitalising	I must not have devitalised
you must not have devitalised
she must not have devitalised
we must not have devitalised
you must not have devitalised
they must not have devitalised	I must not have been devitalising
you must not have been devitalising
she must not have been devitalising
we must not have been devitalising
you must not have been devitalising
they must not have been devitalising	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I devitalise?
must you devitalise?
must she devitalise?
must we devitalise?
must you devitalise?
must they devitalise? 	must I be devitalising?
must you be devitalising?
must she be devitalising?
must we be devitalising?
must you be devitalising?
must they be devitalising? 	must I have devitalised?
must you have devitalised?
must she have devitalised?
must we have devitalised?
must you have devitalised?
must they have devitalised? 	must I have been devitalising?
must you have been devitalising?
must she have been devitalising?
must we have been devitalising?
must you have been devitalising?
must they have been devitalising? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not devitalise?
must you not devitalise?
must she not devitalise?
must we not devitalise?
must you not devitalise?
must they not devitalise? 	must I not be devitalising?
must you not be devitalising?
must she not be devitalising?
must we not be devitalising?
must you not be devitalising?
must they not be devitalising? 	must I not have devitalised?
must you not have devitalised?
must she not have devitalised?
must we not have devitalised?
must you not have devitalised?
must they not have devitalised? 	must I not have been devitalising?
must you not have been devitalising?
must she not have been devitalising?
must we not have been devitalising?
must you not have been devitalising?
must they not have been devitalising?