I must poke you must poke he must poke we must poke you must poke they must poke
V-ing form
I must be poking you must be poking he must be poking we must be poking you must be poking they must be poking
Perfect
I must have poked you must have poked he must have poked we must have poked you must have poked they must have poked
V-ing perfect
I must have been poking you must have been poking he must have been poking we must have been poking you must have been poking they must have been poking
Negation
Simple form
I mustn't poke you mustn't poke he mustn't poke we mustn't poke you mustn't poke they mustn't poke
V-ing form
I mustn't be poking you mustn't be poking he mustn't be poking we mustn't be poking you mustn't be poking they mustn't be poking
Perfect
I mustn't have poked you mustn't have poked he mustn't have poked we mustn't have poked you mustn't have poked they mustn't have poked
V-ing perfect
I mustn't have been poking you mustn't have been poking he mustn't have been poking we mustn't have been poking you mustn't have been poking they mustn't have been poking
Interrogative form
Simple form
must I poke? must you poke? must he poke? must we poke? must you poke? must they poke?
V-ing form
must I be poking? must you be poking? must he be poking? must we be poking? must you be poking? must they be poking?
Perfect
must I have poked? must you have poked? must he have poked? must we have poked? must you have poked? must they have poked?
V-ing perfect
must I have been poking? must you have been poking? must he have been poking? must we have been poking? must you have been poking? must they have been poking?
Interro-negative form
Simple form
mustn't I poke? mustn't you poke? mustn't he poke? mustn't we poke? mustn't you poke? mustn't they poke?
V-ing form
mustn't I be poking? mustn't you be poking? mustn't he be poking? mustn't we be poking? mustn't you be poking? mustn't they be poking?
Perfect
mustn't I have poked? mustn't you have poked? mustn't he have poked? mustn't we have poked? mustn't you have poked? mustn't they have poked?
V-ing perfect
mustn't I have been poking? mustn't you have been poking? mustn't he have been poking? mustn't we have been poking? mustn't you have been poking? mustn't they have been poking?