I must ping-pong you must ping-pong she 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 she 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 she 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 she 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 must not ping-pong you must not ping-pong she must not ping-pong we must not ping-pong you must not ping-pong they must not ping-pong
V-ing form
I must not be ping-ponging you must not be ping-ponging she must not be ping-ponging we must not be ping-ponging you must not be ping-ponging they must not be ping-ponging
Perfect
I must not have ping-ponged you must not have ping-ponged she must not have ping-ponged we must not have ping-ponged you must not have ping-ponged they must not have ping-ponged
V-ing perfect
I must not have been ping-ponging you must not have been ping-ponging she must not have been ping-ponging we must not have been ping-ponging you must not have been ping-ponging they must not have been ping-ponging
Interrogative form
Simple form
must I ping-pong? must you ping-pong? must she 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 she 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 she 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 she 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
must I not ping-pong? must you not ping-pong? must she not ping-pong? must we not ping-pong? must you not ping-pong? must they not ping-pong?
V-ing form
must I not be ping-ponging? must you not be ping-ponging? must she not be ping-ponging? must we not be ping-ponging? must you not be ping-ponging? must they not be ping-ponging?
Perfect
must I not have ping-ponged? must you not have ping-ponged? must she not have ping-ponged? must we not have ping-ponged? must you not have ping-ponged? must they not have ping-ponged?
V-ing perfect
must I not have been ping-ponging? must you not have been ping-ponging? must she not have been ping-ponging? must we not have been ping-ponging? must you not have been ping-ponging? must they not have been ping-ponging?