could sham
Verbo regular: sham - shammed- shammed

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could sham
you could sham
he could sham
we could sham
you could sham
they could sham 	I could be shamming
you could be shamming
he could be shamming
we could be shamming
you could be shamming
they could be shamming	I could have shammed
you could have shammed
he could have shammed
we could have shammed
you could have shammed
they could have shammed	I could have been shamming
you could have been shamming
he could have been shamming
we could have been shamming
you could have been shamming
they could have been shamming	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I couldn't sham
you couldn't sham
he couldn't sham
we couldn't sham
you couldn't sham
they couldn't sham 	I couldn't be shamming
you couldn't be shamming
he couldn't be shamming
we couldn't be shamming
you couldn't be shamming
they couldn't be shamming	I couldn't have shammed
you couldn't have shammed
he couldn't have shammed
we couldn't have shammed
you couldn't have shammed
they couldn't have shammed	I couldn't have been shamming
you couldn't have been shamming
he couldn't have been shamming
we couldn't have been shamming
you couldn't have been shamming
they couldn't have been shamming	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I sham?
could you sham?
could he sham?
could we sham?
could you sham?
could they sham? 	could I be shamming?
could you be shamming?
could he be shamming?
could we be shamming?
could you be shamming?
could they be shamming? 	could I have shammed?
could you have shammed?
could he have shammed?
could we have shammed?
could you have shammed?
could they have shammed? 	could I have been shamming?
could you have been shamming?
could he have been shamming?
could we have been shamming?
could you have been shamming?
could they have been shamming? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
couldn't I sham?
couldn't you sham?
couldn't he sham?
couldn't we sham?
couldn't you sham?
couldn't they sham? 	couldn't I be shamming?
couldn't you be shamming?
couldn't he be shamming?
couldn't we be shamming?
couldn't you be shamming?
couldn't they be shamming? 	couldn't I have shammed?
couldn't you have shammed?
couldn't he have shammed?
couldn't we have shammed?
couldn't you have shammed?
couldn't they have shammed? 	couldn't I have been shamming?
couldn't you have been shamming?
couldn't he have been shamming?
couldn't we have been shamming?
couldn't you have been shamming?
couldn't they have been shamming?