must scan
Regular verb: scan - scanned- scanned

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must scan
you must scan
he must scan
we must scan
you must scan
they must scan 	I must be scanning
you must be scanning
he must be scanning
we must be scanning
you must be scanning
they must be scanning	I must have scanned
you must have scanned
he must have scanned
we must have scanned
you must have scanned
they must have scanned	I must have been scanning
you must have been scanning
he must have been scanning
we must have been scanning
you must have been scanning
they must have been scanning	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't scan
you mustn't scan
he mustn't scan
we mustn't scan
you mustn't scan
they mustn't scan 	I mustn't be scanning
you mustn't be scanning
he mustn't be scanning
we mustn't be scanning
you mustn't be scanning
they mustn't be scanning	I mustn't have scanned
you mustn't have scanned
he mustn't have scanned
we mustn't have scanned
you mustn't have scanned
they mustn't have scanned	I mustn't have been scanning
you mustn't have been scanning
he mustn't have been scanning
we mustn't have been scanning
you mustn't have been scanning
they mustn't have been scanning	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I scan?
must you scan?
must he scan?
must we scan?
must you scan?
must they scan? 	must I be scanning?
must you be scanning?
must he be scanning?
must we be scanning?
must you be scanning?
must they be scanning? 	must I have scanned?
must you have scanned?
must he have scanned?
must we have scanned?
must you have scanned?
must they have scanned? 	must I have been scanning?
must you have been scanning?
must he have been scanning?
must we have been scanning?
must you have been scanning?
must they have been scanning? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I scan?
mustn't you scan?
mustn't he scan?
mustn't we scan?
mustn't you scan?
mustn't they scan? 	mustn't I be scanning?
mustn't you be scanning?
mustn't he be scanning?
mustn't we be scanning?
mustn't you be scanning?
mustn't they be scanning? 	mustn't I have scanned?
mustn't you have scanned?
mustn't he have scanned?
mustn't we have scanned?
mustn't you have scanned?
mustn't they have scanned? 	mustn't I have been scanning?
mustn't you have been scanning?
mustn't he have been scanning?
mustn't we have been scanning?
mustn't you have been scanning?
mustn't they have been scanning?