English verb conjugation
COULD WHITE

Regular verb: white - whited - whited

Affirmation

Simple form	V-ing form
I could white you could white he could white we could white you could white they could white	I could be whiting you could be whiting he could be whiting we could be whiting you could be whiting they could be whiting
Perfect	V-ing perfect
I could have whited you could have whited he could have whited we could have whited you could have whited they could have whited	I could have been whiting you could have been whiting he could have been whiting we could have been whiting you could have been whiting they could have been whiting

Negation

Simple form	V-ing form
I couldn't white you couldn't white he couldn't white we couldn't white you couldn't white they couldn't white	I couldn't be whiting you couldn't be whiting he couldn't be whiting we couldn't be whiting you couldn't be whiting they couldn't be whiting
Perfect	V-ing perfect
I couldn't have whited you couldn't have whited he couldn't have whited we couldn't have whited you couldn't have whited they couldn't have whited	I couldn't have been whiting you couldn't have been whiting he couldn't have been whiting we couldn't have been whiting you couldn't have been whiting they couldn't have been whiting

Interrogative form

Simple form	V-ing form
could I white? could you white? could he white? could we white? could you white? could they white?	could I be whiting? could you be whiting? could he be whiting? could we be whiting? could you be whiting? could they be whiting?
Perfect	V-ing perfect
could I have whited? could you have whited? could he have whited? could we have whited? could you have whited? could they have whited?	could I have been whiting? could you have been whiting? could he have been whiting? could we have been whiting? could you have been whiting? could they have been whiting?

Interro-negative form

Simple form	V-ing form
couldn't I white? couldn't you white? couldn't he white? couldn't we white? couldn't you white? couldn't they white?	couldn't I be whiting? couldn't you be whiting? couldn't he be whiting? couldn't we be whiting? couldn't you be whiting? couldn't they be whiting?
Perfect	V-ing perfect
couldn't I have whited? couldn't you have whited? couldn't he have whited? couldn't we have whited? couldn't you have whited? couldn't they have whited?	couldn't I have been whiting? couldn't you have been whiting? couldn't he have been whiting? couldn't we have been whiting? couldn't you have been whiting? couldn't they have been whiting?