must presterilise
Regular verb: presterilise - presterilised- presterilised

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must presterilise
you must presterilise
he must presterilise
we must presterilise
you must presterilise
they must presterilise 	I must be presterilising
you must be presterilising
he must be presterilising
we must be presterilising
you must be presterilising
they must be presterilising	I must have presterilised
you must have presterilised
he must have presterilised
we must have presterilised
you must have presterilised
they must have presterilised	I must have been presterilising
you must have been presterilising
he must have been presterilising
we must have been presterilising
you must have been presterilising
they must have been presterilising	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not presterilise
you must not presterilise
he must not presterilise
we must not presterilise
you must not presterilise
they must not presterilise 	I must not be presterilising
you must not be presterilising
he must not be presterilising
we must not be presterilising
you must not be presterilising
they must not be presterilising	I must not have presterilised
you must not have presterilised
he must not have presterilised
we must not have presterilised
you must not have presterilised
they must not have presterilised	I must not have been presterilising
you must not have been presterilising
he must not have been presterilising
we must not have been presterilising
you must not have been presterilising
they must not have been presterilising	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I presterilise?
must you presterilise?
must he presterilise?
must we presterilise?
must you presterilise?
must they presterilise? 	must I be presterilising?
must you be presterilising?
must he be presterilising?
must we be presterilising?
must you be presterilising?
must they be presterilising? 	must I have presterilised?
must you have presterilised?
must he have presterilised?
must we have presterilised?
must you have presterilised?
must they have presterilised? 	must I have been presterilising?
must you have been presterilising?
must he have been presterilising?
must we have been presterilising?
must you have been presterilising?
must they have been presterilising? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not presterilise?
must you not presterilise?
must he not presterilise?
must we not presterilise?
must you not presterilise?
must they not presterilise? 	must I not be presterilising?
must you not be presterilising?
must he not be presterilising?
must we not be presterilising?
must you not be presterilising?
must they not be presterilising? 	must I not have presterilised?
must you not have presterilised?
must he not have presterilised?
must we not have presterilised?
must you not have presterilised?
must they not have presterilised? 	must I not have been presterilising?
must you not have been presterilising?
must he not have been presterilising?
must we not have been presterilising?
must you not have been presterilising?
must they not have been presterilising?