English verb conjugation
COULD DISAPPEAR

Regular verb: disappear - disappeared - disappeared

Affirmation

Simple form	V-ing form
I could disappear you could disappear she could disappear we could disappear you could disappear they could disappear	I could be disappearing you could be disappearing she could be disappearing we could be disappearing you could be disappearing they could be disappearing
Perfect	V-ing perfect
I could have disappeared you could have disappeared she could have disappeared we could have disappeared you could have disappeared they could have disappeared	I could have been disappearing you could have been disappearing she could have been disappearing we could have been disappearing you could have been disappearing they could have been disappearing

Negation

Simple form	V-ing form
I could not disappear you could not disappear she could not disappear we could not disappear you could not disappear they could not disappear	I could not be disappearing you could not be disappearing she could not be disappearing we could not be disappearing you could not be disappearing they could not be disappearing
Perfect	V-ing perfect
I could not have disappeared you could not have disappeared she could not have disappeared we could not have disappeared you could not have disappeared they could not have disappeared	I could not have been disappearing you could not have been disappearing she could not have been disappearing we could not have been disappearing you could not have been disappearing they could not have been disappearing

Interrogative form

Simple form	V-ing form
could I disappear? could you disappear? could she disappear? could we disappear? could you disappear? could they disappear?	could I be disappearing? could you be disappearing? could she be disappearing? could we be disappearing? could you be disappearing? could they be disappearing?
Perfect	V-ing perfect
could I have disappeared? could you have disappeared? could she have disappeared? could we have disappeared? could you have disappeared? could they have disappeared?	could I have been disappearing? could you have been disappearing? could she have been disappearing? could we have been disappearing? could you have been disappearing? could they have been disappearing?

Interro-negative form

Simple form	V-ing form
could I not disappear? could you not disappear? could she not disappear? could we not disappear? could you not disappear? could they not disappear?	could I not be disappearing? could you not be disappearing? could she not be disappearing? could we not be disappearing? could you not be disappearing? could they not be disappearing?
Perfect	V-ing perfect
could I not have disappeared? could you not have disappeared? could she not have disappeared? could we not have disappeared? could you not have disappeared? could they not have disappeared?	could I not have been disappearing? could you not have been disappearing? could she not have been disappearing? could we not have been disappearing? could you not have been disappearing? could they not have been disappearing?