must sterilise
Regular verb: sterilise - sterilised- sterilised

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must sterilise
you must sterilise
she must sterilise
we must sterilise
you must sterilise
they must sterilise 	I must be sterilising
you must be sterilising
she must be sterilising
we must be sterilising
you must be sterilising
they must be sterilising	I must have sterilised
you must have sterilised
she must have sterilised
we must have sterilised
you must have sterilised
they must have sterilised	I must have been sterilising
you must have been sterilising
she must have been sterilising
we must have been sterilising
you must have been sterilising
they must have been sterilising	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't sterilise
you mustn't sterilise
she mustn't sterilise
we mustn't sterilise
you mustn't sterilise
they mustn't sterilise 	I mustn't be sterilising
you mustn't be sterilising
she mustn't be sterilising
we mustn't be sterilising
you mustn't be sterilising
they mustn't be sterilising	I mustn't have sterilised
you mustn't have sterilised
she mustn't have sterilised
we mustn't have sterilised
you mustn't have sterilised
they mustn't have sterilised	I mustn't have been sterilising
you mustn't have been sterilising
she mustn't have been sterilising
we mustn't have been sterilising
you mustn't have been sterilising
they mustn't have been sterilising	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I sterilise?
must you sterilise?
must she sterilise?
must we sterilise?
must you sterilise?
must they sterilise? 	must I be sterilising?
must you be sterilising?
must she be sterilising?
must we be sterilising?
must you be sterilising?
must they be sterilising? 	must I have sterilised?
must you have sterilised?
must she have sterilised?
must we have sterilised?
must you have sterilised?
must they have sterilised? 	must I have been sterilising?
must you have been sterilising?
must she have been sterilising?
must we have been sterilising?
must you have been sterilising?
must they have been sterilising? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I sterilise?
mustn't you sterilise?
mustn't she sterilise?
mustn't we sterilise?
mustn't you sterilise?
mustn't they sterilise? 	mustn't I be sterilising?
mustn't you be sterilising?
mustn't she be sterilising?
mustn't we be sterilising?
mustn't you be sterilising?
mustn't they be sterilising? 	mustn't I have sterilised?
mustn't you have sterilised?
mustn't she have sterilised?
mustn't we have sterilised?
mustn't you have sterilised?
mustn't they have sterilised? 	mustn't I have been sterilising?
mustn't you have been sterilising?
mustn't she have been sterilising?
mustn't we have been sterilising?
mustn't you have been sterilising?
mustn't they have been sterilising?