Warning, this verb may not exist. Conjugation is given as example.
Affirmation
Simple form
I must envy envy you must envy envy she must envy envy we must envy envy you must envy envy they must envy envy
V-ing form
I must be envy envying you must be envy envying she must be envy envying we must be envy envying you must be envy envying they must be envy envying
Perfect
I must have envy envied you must have envy envied she must have envy envied we must have envy envied you must have envy envied they must have envy envied
V-ing perfect
I must have been envy envying you must have been envy envying she must have been envy envying we must have been envy envying you must have been envy envying they must have been envy envying
Negation
Simple form
I mustn't envy envy you mustn't envy envy she mustn't envy envy we mustn't envy envy you mustn't envy envy they mustn't envy envy
V-ing form
I mustn't be envy envying you mustn't be envy envying she mustn't be envy envying we mustn't be envy envying you mustn't be envy envying they mustn't be envy envying
Perfect
I mustn't have envy envied you mustn't have envy envied she mustn't have envy envied we mustn't have envy envied you mustn't have envy envied they mustn't have envy envied
V-ing perfect
I mustn't have been envy envying you mustn't have been envy envying she mustn't have been envy envying we mustn't have been envy envying you mustn't have been envy envying they mustn't have been envy envying
Interrogative form
Simple form
must I envy envy? must you envy envy? must she envy envy? must we envy envy? must you envy envy? must they envy envy?
V-ing form
must I be envy envying? must you be envy envying? must she be envy envying? must we be envy envying? must you be envy envying? must they be envy envying?
Perfect
must I have envy envied? must you have envy envied? must she have envy envied? must we have envy envied? must you have envy envied? must they have envy envied?
V-ing perfect
must I have been envy envying? must you have been envy envying? must she have been envy envying? must we have been envy envying? must you have been envy envying? must they have been envy envying?
Interro-negative form
Simple form
mustn't I envy envy? mustn't you envy envy? mustn't she envy envy? mustn't we envy envy? mustn't you envy envy? mustn't they envy envy?
V-ing form
mustn't I be envy envying? mustn't you be envy envying? mustn't she be envy envying? mustn't we be envy envying? mustn't you be envy envying? mustn't they be envy envying?
Perfect
mustn't I have envy envied? mustn't you have envy envied? mustn't she have envy envied? mustn't we have envy envied? mustn't you have envy envied? mustn't they have envy envied?
V-ing perfect
mustn't I have been envy envying? mustn't you have been envy envying? mustn't she have been envy envying? mustn't we have been envy envying? mustn't you have been envy envying? mustn't they have been envy envying?