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