English verb conjugation
COULD SHAM

Regular verb: sham - shammed - shammed

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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

Negation

Simple form	V-ing form
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
Perfect	V-ing perfect
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

Interrogative form

Simple form	V-ing form
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?
Perfect	V-ing perfect
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?

Interro-negative form

Simple form	V-ing form
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?
Perfect	V-ing perfect
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?