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