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