I must air-condition you must air-condition she must air-condition we must air-condition you must air-condition they must air-condition
V-ing form
I must be air-conditioning you must be air-conditioning she must be air-conditioning we must be air-conditioning you must be air-conditioning they must be air-conditioning
Perfect
I must have air-conditioned you must have air-conditioned she must have air-conditioned we must have air-conditioned you must have air-conditioned they must have air-conditioned
V-ing perfect
I must have been air-conditioning you must have been air-conditioning she 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
I mustn't air-condition you mustn't air-condition she mustn't air-condition we mustn't air-condition you mustn't air-condition they mustn't air-condition
V-ing form
I mustn't be air-conditioning you mustn't be air-conditioning she mustn't be air-conditioning we mustn't be air-conditioning you mustn't be air-conditioning they mustn't be air-conditioning
Perfect
I mustn't have air-conditioned you mustn't have air-conditioned she mustn't have air-conditioned we mustn't have air-conditioned you mustn't have air-conditioned they mustn't have air-conditioned
V-ing perfect
I mustn't have been air-conditioning you mustn't have been air-conditioning she mustn't have been air-conditioning we mustn't have been air-conditioning you mustn't have been air-conditioning they mustn't have been air-conditioning
Interrogative form
Simple form
must I air-condition? must you air-condition? must she air-condition? must we air-condition? must you air-condition? must they air-condition?
V-ing form
must I be air-conditioning? must you be air-conditioning? must she be air-conditioning? must we be air-conditioning? must you be air-conditioning? must they be air-conditioning?
Perfect
must I have air-conditioned? must you have air-conditioned? must she have air-conditioned? must we have air-conditioned? must you have air-conditioned? must they have air-conditioned?
V-ing perfect
must I have been air-conditioning? must you have been air-conditioning? must she 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
mustn't I air-condition? mustn't you air-condition? mustn't she air-condition? mustn't we air-condition? mustn't you air-condition? mustn't they air-condition?
V-ing form
mustn't I be air-conditioning? mustn't you be air-conditioning? mustn't she be air-conditioning? mustn't we be air-conditioning? mustn't you be air-conditioning? mustn't they be air-conditioning?
Perfect
mustn't I have air-conditioned? mustn't you have air-conditioned? mustn't she have air-conditioned? mustn't we have air-conditioned? mustn't you have air-conditioned? mustn't they have air-conditioned?
V-ing perfect
mustn't I have been air-conditioning? mustn't you have been air-conditioning? mustn't she have been air-conditioning? mustn't we have been air-conditioning? mustn't you have been air-conditioning? mustn't they have been air-conditioning?