must air-condition
Regular verb: air-condition - air-conditioned- air-conditioned

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must air-condition
you must air-condition
he must air-condition
we must air-condition
you must air-condition
they must air-condition 	I must be air-conditioning
you must be air-conditioning
he must be air-conditioning
we must be air-conditioning
you must be air-conditioning
they must be air-conditioning	I must have air-conditioned
you must have air-conditioned
he must have air-conditioned
we must have air-conditioned
you must have air-conditioned
they must have air-conditioned	I must have been air-conditioning
you must have been air-conditioning
he must have been air-conditioning
we must have been air-conditioning
you must have been air-conditioning
they must have been air-conditioning	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not air-condition
you must not air-condition
he must not air-condition
we must not air-condition
you must not air-condition
they must not air-condition 	I must not be air-conditioning
you must not be air-conditioning
he must not be air-conditioning
we must not be air-conditioning
you must not be air-conditioning
they must not be air-conditioning	I must not have air-conditioned
you must not have air-conditioned
he must not have air-conditioned
we must not have air-conditioned
you must not have air-conditioned
they must not have air-conditioned	I must not have been air-conditioning
you must not have been air-conditioning
he must not have been air-conditioning
we must not have been air-conditioning
you must not have been air-conditioning
they must not have been air-conditioning	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I air-condition?
must you air-condition?
must he air-condition?
must we air-condition?
must you air-condition?
must they air-condition? 	must I be air-conditioning?
must you be air-conditioning?
must he be air-conditioning?
must we be air-conditioning?
must you be air-conditioning?
must they be air-conditioning? 	must I have air-conditioned?
must you have air-conditioned?
must he have air-conditioned?
must we have air-conditioned?
must you have air-conditioned?
must they have air-conditioned? 	must I have been air-conditioning?
must you have been air-conditioning?
must he have been air-conditioning?
must we have been air-conditioning?
must you have been air-conditioning?
must they have been air-conditioning? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not air-condition?
must you not air-condition?
must he not air-condition?
must we not air-condition?
must you not air-condition?
must they not air-condition? 	must I not be air-conditioning?
must you not be air-conditioning?
must he not be air-conditioning?
must we not be air-conditioning?
must you not be air-conditioning?
must they not be air-conditioning? 	must I not have air-conditioned?
must you not have air-conditioned?
must he not have air-conditioned?
must we not have air-conditioned?
must you not have air-conditioned?
must they not have air-conditioned? 	must I not have been air-conditioning?
must you not have been air-conditioning?
must he not have been air-conditioning?
must we not have been air-conditioning?
must you not have been air-conditioning?
must they not have been air-conditioning?