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 must not prewarm
you must not prewarm
she must not prewarm
we must not prewarm
you must not prewarm
they must not prewarm 	I must not be prewarming
you must not be prewarming
she must not be prewarming
we must not be prewarming
you must not be prewarming
they must not be prewarming	I must not have prewarmed
you must not have prewarmed
she must not have prewarmed
we must not have prewarmed
you must not have prewarmed
they must not have prewarmed	I must not have been prewarming
you must not have been prewarming
she must not have been prewarming
we must not have been prewarming
you must not have been prewarming
they must not 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 	
must I not prewarm?
must you not prewarm?
must she not prewarm?
must we not prewarm?
must you not prewarm?
must they not prewarm? 	must I not be prewarming?
must you not be prewarming?
must she not be prewarming?
must we not be prewarming?
must you not be prewarming?
must they not be prewarming? 	must I not have prewarmed?
must you not have prewarmed?
must she not have prewarmed?
must we not have prewarmed?
must you not have prewarmed?
must they not have prewarmed? 	must I not have been prewarming?
must you not have been prewarming?
must she not have been prewarming?
must we not have been prewarming?
must you not have been prewarming?
must they not have been prewarming?