I must ping-pong you must ping-pong he must ping-pong we must ping-pong you must ping-pong they must ping-pong
V-ing form
I must be ping-ponging you must be ping-ponging he must be ping-ponging we must be ping-ponging you must be ping-ponging they must be ping-ponging
Perfect
I must have ping-ponged you must have ping-ponged he must have ping-ponged we must have ping-ponged you must have ping-ponged they must have ping-ponged
V-ing perfect
I must have been ping-ponging you must have been ping-ponging he must have been ping-ponging we must have been ping-ponging you must have been ping-ponging they must have been ping-ponging
Negation
Simple form
I mustn't ping-pong you mustn't ping-pong he mustn't ping-pong we mustn't ping-pong you mustn't ping-pong they mustn't ping-pong
V-ing form
I mustn't be ping-ponging you mustn't be ping-ponging he mustn't be ping-ponging we mustn't be ping-ponging you mustn't be ping-ponging they mustn't be ping-ponging
Perfect
I mustn't have ping-ponged you mustn't have ping-ponged he mustn't have ping-ponged we mustn't have ping-ponged you mustn't have ping-ponged they mustn't have ping-ponged
V-ing perfect
I mustn't have been ping-ponging you mustn't have been ping-ponging he mustn't have been ping-ponging we mustn't have been ping-ponging you mustn't have been ping-ponging they mustn't have been ping-ponging
Interrogative form
Simple form
must I ping-pong? must you ping-pong? must he ping-pong? must we ping-pong? must you ping-pong? must they ping-pong?
V-ing form
must I be ping-ponging? must you be ping-ponging? must he be ping-ponging? must we be ping-ponging? must you be ping-ponging? must they be ping-ponging?
Perfect
must I have ping-ponged? must you have ping-ponged? must he have ping-ponged? must we have ping-ponged? must you have ping-ponged? must they have ping-ponged?
V-ing perfect
must I have been ping-ponging? must you have been ping-ponging? must he have been ping-ponging? must we have been ping-ponging? must you have been ping-ponging? must they have been ping-ponging?
Interro-negative form
Simple form
mustn't I ping-pong? mustn't you ping-pong? mustn't he ping-pong? mustn't we ping-pong? mustn't you ping-pong? mustn't they ping-pong?
V-ing form
mustn't I be ping-ponging? mustn't you be ping-ponging? mustn't he be ping-ponging? mustn't we be ping-ponging? mustn't you be ping-ponging? mustn't they be ping-ponging?
Perfect
mustn't I have ping-ponged? mustn't you have ping-ponged? mustn't he have ping-ponged? mustn't we have ping-ponged? mustn't you have ping-ponged? mustn't they have ping-ponged?
V-ing perfect
mustn't I have been ping-ponging? mustn't you have been ping-ponging? mustn't he have been ping-ponging? mustn't we have been ping-ponging? mustn't you have been ping-ponging? mustn't they have been ping-ponging?