must zigzag
Regular verb: zigzag - zigzagged- zigzagged

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must zigzag
you must zigzag
she must zigzag
we must zigzag
you must zigzag
they must zigzag 	I must be zigzagging
you must be zigzagging
she must be zigzagging
we must be zigzagging
you must be zigzagging
they must be zigzagging	I must have zigzagged
you must have zigzagged
she must have zigzagged
we must have zigzagged
you must have zigzagged
they must have zigzagged	I must have been zigzagging
you must have been zigzagging
she must have been zigzagging
we must have been zigzagging
you must have been zigzagging
they must have been zigzagging	

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

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