I must click you must click he must click we must click you must click they must click
V-ing form
I must be clicking you must be clicking he must be clicking we must be clicking you must be clicking they must be clicking
Perfect
I must have clicked you must have clicked he must have clicked we must have clicked you must have clicked they must have clicked
V-ing perfect
I must have been clicking you must have been clicking he must have been clicking we must have been clicking you must have been clicking they must have been clicking
Negation
Simple form
I mustn't click you mustn't click he mustn't click we mustn't click you mustn't click they mustn't click
V-ing form
I mustn't be clicking you mustn't be clicking he mustn't be clicking we mustn't be clicking you mustn't be clicking they mustn't be clicking
Perfect
I mustn't have clicked you mustn't have clicked he mustn't have clicked we mustn't have clicked you mustn't have clicked they mustn't have clicked
V-ing perfect
I mustn't have been clicking you mustn't have been clicking he mustn't have been clicking we mustn't have been clicking you mustn't have been clicking they mustn't have been clicking
Interrogative form
Simple form
must I click? must you click? must he click? must we click? must you click? must they click?
V-ing form
must I be clicking? must you be clicking? must he be clicking? must we be clicking? must you be clicking? must they be clicking?
Perfect
must I have clicked? must you have clicked? must he have clicked? must we have clicked? must you have clicked? must they have clicked?
V-ing perfect
must I have been clicking? must you have been clicking? must he have been clicking? must we have been clicking? must you have been clicking? must they have been clicking?
Interro-negative form
Simple form
mustn't I click? mustn't you click? mustn't he click? mustn't we click? mustn't you click? mustn't they click?
V-ing form
mustn't I be clicking? mustn't you be clicking? mustn't he be clicking? mustn't we be clicking? mustn't you be clicking? mustn't they be clicking?
Perfect
mustn't I have clicked? mustn't you have clicked? mustn't he have clicked? mustn't we have clicked? mustn't you have clicked? mustn't they have clicked?
V-ing perfect
mustn't I have been clicking? mustn't you have been clicking? mustn't he have been clicking? mustn't we have been clicking? mustn't you have been clicking? mustn't they have been clicking?