I must unhook you must unhook he must unhook we must unhook you must unhook they must unhook
V-ing form
I must be unhooking you must be unhooking he must be unhooking we must be unhooking you must be unhooking they must be unhooking
Perfect
I must have unhooked you must have unhooked he must have unhooked we must have unhooked you must have unhooked they must have unhooked
V-ing perfect
I must have been unhooking you must have been unhooking he must have been unhooking we must have been unhooking you must have been unhooking they must have been unhooking
Negation
Simple form
I must not unhook you must not unhook he must not unhook we must not unhook you must not unhook they must not unhook
V-ing form
I must not be unhooking you must not be unhooking he must not be unhooking we must not be unhooking you must not be unhooking they must not be unhooking
Perfect
I must not have unhooked you must not have unhooked he must not have unhooked we must not have unhooked you must not have unhooked they must not have unhooked
V-ing perfect
I must not have been unhooking you must not have been unhooking he must not have been unhooking we must not have been unhooking you must not have been unhooking they must not have been unhooking
Interrogative form
Simple form
must I unhook? must you unhook? must he unhook? must we unhook? must you unhook? must they unhook?
V-ing form
must I be unhooking? must you be unhooking? must he be unhooking? must we be unhooking? must you be unhooking? must they be unhooking?
Perfect
must I have unhooked? must you have unhooked? must he have unhooked? must we have unhooked? must you have unhooked? must they have unhooked?
V-ing perfect
must I have been unhooking? must you have been unhooking? must he have been unhooking? must we have been unhooking? must you have been unhooking? must they have been unhooking?
Interro-negative form
Simple form
must I not unhook? must you not unhook? must he not unhook? must we not unhook? must you not unhook? must they not unhook?
V-ing form
must I not be unhooking? must you not be unhooking? must he not be unhooking? must we not be unhooking? must you not be unhooking? must they not be unhooking?
Perfect
must I not have unhooked? must you not have unhooked? must he not have unhooked? must we not have unhooked? must you not have unhooked? must they not have unhooked?
V-ing perfect
must I not have been unhooking? must you not have been unhooking? must he not have been unhooking? must we not have been unhooking? must you not have been unhooking? must they not have been unhooking?