must cool
Regular verb: cool - cooled- cooled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must cool
you must cool
he must cool
we must cool
you must cool
they must cool 	I must be cooling
you must be cooling
he must be cooling
we must be cooling
you must be cooling
they must be cooling	I must have cooled
you must have cooled
he must have cooled
we must have cooled
you must have cooled
they must have cooled	I must have been cooling
you must have been cooling
he must have been cooling
we must have been cooling
you must have been cooling
they must have been cooling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't cool
you mustn't cool
he mustn't cool
we mustn't cool
you mustn't cool
they mustn't cool 	I mustn't be cooling
you mustn't be cooling
he mustn't be cooling
we mustn't be cooling
you mustn't be cooling
they mustn't be cooling	I mustn't have cooled
you mustn't have cooled
he mustn't have cooled
we mustn't have cooled
you mustn't have cooled
they mustn't have cooled	I mustn't have been cooling
you mustn't have been cooling
he mustn't have been cooling
we mustn't have been cooling
you mustn't have been cooling
they mustn't have been cooling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I cool?
must you cool?
must he cool?
must we cool?
must you cool?
must they cool? 	must I be cooling?
must you be cooling?
must he be cooling?
must we be cooling?
must you be cooling?
must they be cooling? 	must I have cooled?
must you have cooled?
must he have cooled?
must we have cooled?
must you have cooled?
must they have cooled? 	must I have been cooling?
must you have been cooling?
must he have been cooling?
must we have been cooling?
must you have been cooling?
must they have been cooling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I cool?
mustn't you cool?
mustn't he cool?
mustn't we cool?
mustn't you cool?
mustn't they cool? 	mustn't I be cooling?
mustn't you be cooling?
mustn't he be cooling?
mustn't we be cooling?
mustn't you be cooling?
mustn't they be cooling? 	mustn't I have cooled?
mustn't you have cooled?
mustn't he have cooled?
mustn't we have cooled?
mustn't you have cooled?
mustn't they have cooled? 	mustn't I have been cooling?
mustn't you have been cooling?
mustn't he have been cooling?
mustn't we have been cooling?
mustn't you have been cooling?
mustn't they have been cooling?