can sham
Regular verb: sham - shammed- shammed

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

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

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

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