must prewarm
Regular verb: prewarm - prewarmed- prewarmed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must prewarm
you must prewarm
she must prewarm
we must prewarm
you must prewarm
they must prewarm 	I must be prewarming
you must be prewarming
she must be prewarming
we must be prewarming
you must be prewarming
they must be prewarming	I must have prewarmed
you must have prewarmed
she must have prewarmed
we must have prewarmed
you must have prewarmed
they must have prewarmed	I must have been prewarming
you must have been prewarming
she must have been prewarming
we must have been prewarming
you must have been prewarming
they must have been prewarming	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't prewarm
you mustn't prewarm
she mustn't prewarm
we mustn't prewarm
you mustn't prewarm
they mustn't prewarm 	I mustn't be prewarming
you mustn't be prewarming
she mustn't be prewarming
we mustn't be prewarming
you mustn't be prewarming
they mustn't be prewarming	I mustn't have prewarmed
you mustn't have prewarmed
she mustn't have prewarmed
we mustn't have prewarmed
you mustn't have prewarmed
they mustn't have prewarmed	I mustn't have been prewarming
you mustn't have been prewarming
she mustn't have been prewarming
we mustn't have been prewarming
you mustn't have been prewarming
they mustn't have been prewarming	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I prewarm?
must you prewarm?
must she prewarm?
must we prewarm?
must you prewarm?
must they prewarm? 	must I be prewarming?
must you be prewarming?
must she be prewarming?
must we be prewarming?
must you be prewarming?
must they be prewarming? 	must I have prewarmed?
must you have prewarmed?
must she have prewarmed?
must we have prewarmed?
must you have prewarmed?
must they have prewarmed? 	must I have been prewarming?
must you have been prewarming?
must she have been prewarming?
must we have been prewarming?
must you have been prewarming?
must they have been prewarming? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I prewarm?
mustn't you prewarm?
mustn't she prewarm?
mustn't we prewarm?
mustn't you prewarm?
mustn't they prewarm? 	mustn't I be prewarming?
mustn't you be prewarming?
mustn't she be prewarming?
mustn't we be prewarming?
mustn't you be prewarming?
mustn't they be prewarming? 	mustn't I have prewarmed?
mustn't you have prewarmed?
mustn't she have prewarmed?
mustn't we have prewarmed?
mustn't you have prewarmed?
mustn't they have prewarmed? 	mustn't I have been prewarming?
mustn't you have been prewarming?
mustn't she have been prewarming?
mustn't we have been prewarming?
mustn't you have been prewarming?
mustn't they have been prewarming?