must air-cool
Regular verb: air-cool - air-cooled- air-cooled

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

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not air-cool
you must not air-cool
he must not air-cool
we must not air-cool
you must not air-cool
they must not air-cool 	I must not be air-cooling
you must not be air-cooling
he must not be air-cooling
we must not be air-cooling
you must not be air-cooling
they must not be air-cooling	I must not have air-cooled
you must not have air-cooled
he must not have air-cooled
we must not have air-cooled
you must not have air-cooled
they must not have air-cooled	I must not have been air-cooling
you must not have been air-cooling
he must not have been air-cooling
we must not have been air-cooling
you must not have been air-cooling
they must not have been air-cooling	

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

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not air-cool?
must you not air-cool?
must he not air-cool?
must we not air-cool?
must you not air-cool?
must they not air-cool? 	must I not be air-cooling?
must you not be air-cooling?
must he not be air-cooling?
must we not be air-cooling?
must you not be air-cooling?
must they not be air-cooling? 	must I not have air-cooled?
must you not have air-cooled?
must he not have air-cooled?
must we not have air-cooled?
must you not have air-cooled?
must they not have air-cooled? 	must I not have been air-cooling?
must you not have been air-cooling?
must he not have been air-cooling?
must we not have been air-cooling?
must you not have been air-cooling?
must they not have been air-cooling?