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