must sham
Regular verb: sham - shammed- shammed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must sham
you must sham
she must sham
we must sham
you must sham
they must sham 	I must be shamming
you must be shamming
she must be shamming
we must be shamming
you must be shamming
they must be shamming	I must have shammed
you must have shammed
she must have shammed
we must have shammed
you must have shammed
they must have shammed	I must have been shamming
you must have been shamming
she must have been shamming
we must have been shamming
you must have been shamming
they must have been shamming	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't sham
you mustn't sham
she mustn't sham
we mustn't sham
you mustn't sham
they mustn't sham 	I mustn't be shamming
you mustn't be shamming
she mustn't be shamming
we mustn't be shamming
you mustn't be shamming
they mustn't be shamming	I mustn't have shammed
you mustn't have shammed
she mustn't have shammed
we mustn't have shammed
you mustn't have shammed
they mustn't have shammed	I mustn't have been shamming
you mustn't have been shamming
she mustn't have been shamming
we mustn't have been shamming
you mustn't have been shamming
they mustn't have been shamming	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I sham?
must you sham?
must she sham?
must we sham?
must you sham?
must they sham? 	must I be shamming?
must you be shamming?
must she be shamming?
must we be shamming?
must you be shamming?
must they be shamming? 	must I have shammed?
must you have shammed?
must she have shammed?
must we have shammed?
must you have shammed?
must they have shammed? 	must I have been shamming?
must you have been shamming?
must she have been shamming?
must we have been shamming?
must you have been shamming?
must they have been shamming? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I sham?
mustn't you sham?
mustn't she sham?
mustn't we sham?
mustn't you sham?
mustn't they sham? 	mustn't I be shamming?
mustn't you be shamming?
mustn't she be shamming?
mustn't we be shamming?
mustn't you be shamming?
mustn't they be shamming? 	mustn't I have shammed?
mustn't you have shammed?
mustn't she have shammed?
mustn't we have shammed?
mustn't you have shammed?
mustn't they have shammed? 	mustn't I have been shamming?
mustn't you have been shamming?
mustn't she have been shamming?
mustn't we have been shamming?
mustn't you have been shamming?
mustn't they have been shamming?