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