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