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 must not scan
you must not scan
he must not scan
we must not scan
you must not scan
they must not scan 	I must not be scanning
you must not be scanning
he must not be scanning
we must not be scanning
you must not be scanning
they must not be scanning	I must not have scanned
you must not have scanned
he must not have scanned
we must not have scanned
you must not have scanned
they must not have scanned	I must not have been scanning
you must not have been scanning
he must not have been scanning
we must not have been scanning
you must not have been scanning
they must not 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 	
must I not scan?
must you not scan?
must he not scan?
must we not scan?
must you not scan?
must they not scan? 	must I not be scanning?
must you not be scanning?
must he not be scanning?
must we not be scanning?
must you not be scanning?
must they not be scanning? 	must I not have scanned?
must you not have scanned?
must he not have scanned?
must we not have scanned?
must you not have scanned?
must they not have scanned? 	must I not have been scanning?
must you not have been scanning?
must he not have been scanning?
must we not have been scanning?
must you not have been scanning?
must they not have been scanning?