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