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 could not sham you could not sham he could not sham we could not sham you could not sham they could not sham	I could not be shamming you could not be shamming he could not be shamming we could not be shamming you could not be shamming they could not be shamming
Perfect	V-ing perfect
I could not have shammed you could not have shammed he could not have shammed we could not have shammed you could not have shammed they could not have shammed	I could not have been shamming you could not have been shamming he could not have been shamming we could not have been shamming you could not have been shamming they could not 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
could I not sham? could you not sham? could he not sham? could we not sham? could you not sham? could they not sham?	could I not be shamming? could you not be shamming? could he not be shamming? could we not be shamming? could you not be shamming? could they not be shamming?
Perfect	V-ing perfect
could I not have shammed? could you not have shammed? could he not have shammed? could we not have shammed? could you not have shammed? could they not have shammed?	could I not have been shamming? could you not have been shamming? could he not have been shamming? could we not have been shamming? could you not have been shamming? could they not have been shamming?