English verb conjugation
COULD SHAM

Regular verb: sham - shammed - shammed

Affirmation

Simple form	V-ing form
I could sham you could sham she could sham we could sham you could sham they could sham	I could be shamming you could be shamming she 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 she 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 she 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 she 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 she 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 she 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 she 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 she sham? could we sham? could you sham? could they sham?	could I be shamming? could you be shamming? could she 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 she 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 she 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 she 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 she 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 she 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 she have been shamming? couldn't we have been shamming? couldn't you have been shamming? couldn't they have been shamming?