must precool
Regular verb: precool - precooled- precooled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must precool
you must precool
she must precool
we must precool
you must precool
they must precool 	I must be precooling
you must be precooling
she must be precooling
we must be precooling
you must be precooling
they must be precooling	I must have precooled
you must have precooled
she must have precooled
we must have precooled
you must have precooled
they must have precooled	I must have been precooling
you must have been precooling
she must have been precooling
we must have been precooling
you must have been precooling
they must have been precooling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't precool
you mustn't precool
she mustn't precool
we mustn't precool
you mustn't precool
they mustn't precool 	I mustn't be precooling
you mustn't be precooling
she mustn't be precooling
we mustn't be precooling
you mustn't be precooling
they mustn't be precooling	I mustn't have precooled
you mustn't have precooled
she mustn't have precooled
we mustn't have precooled
you mustn't have precooled
they mustn't have precooled	I mustn't have been precooling
you mustn't have been precooling
she mustn't have been precooling
we mustn't have been precooling
you mustn't have been precooling
they mustn't have been precooling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I precool?
must you precool?
must she precool?
must we precool?
must you precool?
must they precool? 	must I be precooling?
must you be precooling?
must she be precooling?
must we be precooling?
must you be precooling?
must they be precooling? 	must I have precooled?
must you have precooled?
must she have precooled?
must we have precooled?
must you have precooled?
must they have precooled? 	must I have been precooling?
must you have been precooling?
must she have been precooling?
must we have been precooling?
must you have been precooling?
must they have been precooling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I precool?
mustn't you precool?
mustn't she precool?
mustn't we precool?
mustn't you precool?
mustn't they precool? 	mustn't I be precooling?
mustn't you be precooling?
mustn't she be precooling?
mustn't we be precooling?
mustn't you be precooling?
mustn't they be precooling? 	mustn't I have precooled?
mustn't you have precooled?
mustn't she have precooled?
mustn't we have precooled?
mustn't you have precooled?
mustn't they have precooled? 	mustn't I have been precooling?
mustn't you have been precooling?
mustn't she have been precooling?
mustn't we have been precooling?
mustn't you have been precooling?
mustn't they have been precooling?