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