I must envy you must envy she must envy we must envy you must envy they must envy
V-ing form
I must be envying you must be envying she must be envying we must be envying you must be envying they must be envying
Perfect
I must have envied you must have envied she must have envied we must have envied you must have envied they must have envied
V-ing perfect
I must have been envying you must have been envying she must have been envying we must have been envying you must have been envying they must have been envying
Negation
Simple form
I mustn't envy you mustn't envy she mustn't envy we mustn't envy you mustn't envy they mustn't envy
V-ing form
I mustn't be envying you mustn't be envying she mustn't be envying we mustn't be envying you mustn't be envying they mustn't be envying
Perfect
I mustn't have envied you mustn't have envied she mustn't have envied we mustn't have envied you mustn't have envied they mustn't have envied
V-ing perfect
I mustn't have been envying you mustn't have been envying she mustn't have been envying we mustn't have been envying you mustn't have been envying they mustn't have been envying
Interrogative form
Simple form
must I envy? must you envy? must she envy? must we envy? must you envy? must they envy?
V-ing form
must I be envying? must you be envying? must she be envying? must we be envying? must you be envying? must they be envying?
Perfect
must I have envied? must you have envied? must she have envied? must we have envied? must you have envied? must they have envied?
V-ing perfect
must I have been envying? must you have been envying? must she have been envying? must we have been envying? must you have been envying? must they have been envying?
Interro-negative form
Simple form
mustn't I envy? mustn't you envy? mustn't she envy? mustn't we envy? mustn't you envy? mustn't they envy?
V-ing form
mustn't I be envying? mustn't you be envying? mustn't she be envying? mustn't we be envying? mustn't you be envying? mustn't they be envying?
Perfect
mustn't I have envied? mustn't you have envied? mustn't she have envied? mustn't we have envied? mustn't you have envied? mustn't they have envied?
V-ing perfect
mustn't I have been envying? mustn't you have been envying? mustn't she have been envying? mustn't we have been envying? mustn't you have been envying? mustn't they have been envying?