must pilfer
Regular verb: pilfer - pilfered- pilfered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must pilfer
you must pilfer
he must pilfer
we must pilfer
you must pilfer
they must pilfer 	I must be pilfering
you must be pilfering
he must be pilfering
we must be pilfering
you must be pilfering
they must be pilfering	I must have pilfered
you must have pilfered
he must have pilfered
we must have pilfered
you must have pilfered
they must have pilfered	I must have been pilfering
you must have been pilfering
he must have been pilfering
we must have been pilfering
you must have been pilfering
they must have been pilfering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't pilfer
you mustn't pilfer
he mustn't pilfer
we mustn't pilfer
you mustn't pilfer
they mustn't pilfer 	I mustn't be pilfering
you mustn't be pilfering
he mustn't be pilfering
we mustn't be pilfering
you mustn't be pilfering
they mustn't be pilfering	I mustn't have pilfered
you mustn't have pilfered
he mustn't have pilfered
we mustn't have pilfered
you mustn't have pilfered
they mustn't have pilfered	I mustn't have been pilfering
you mustn't have been pilfering
he mustn't have been pilfering
we mustn't have been pilfering
you mustn't have been pilfering
they mustn't have been pilfering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I pilfer?
must you pilfer?
must he pilfer?
must we pilfer?
must you pilfer?
must they pilfer? 	must I be pilfering?
must you be pilfering?
must he be pilfering?
must we be pilfering?
must you be pilfering?
must they be pilfering? 	must I have pilfered?
must you have pilfered?
must he have pilfered?
must we have pilfered?
must you have pilfered?
must they have pilfered? 	must I have been pilfering?
must you have been pilfering?
must he have been pilfering?
must we have been pilfering?
must you have been pilfering?
must they have been pilfering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I pilfer?
mustn't you pilfer?
mustn't he pilfer?
mustn't we pilfer?
mustn't you pilfer?
mustn't they pilfer? 	mustn't I be pilfering?
mustn't you be pilfering?
mustn't he be pilfering?
mustn't we be pilfering?
mustn't you be pilfering?
mustn't they be pilfering? 	mustn't I have pilfered?
mustn't you have pilfered?
mustn't he have pilfered?
mustn't we have pilfered?
mustn't you have pilfered?
mustn't they have pilfered? 	mustn't I have been pilfering?
mustn't you have been pilfering?
mustn't he have been pilfering?
mustn't we have been pilfering?
mustn't you have been pilfering?
mustn't they have been pilfering?