English verb conjugation
COULD DISAPPEAR

Regular verb: disappear - disappeared - disappeared

Affirmation

Simple form	V-ing form
I could disappear you could disappear he could disappear we could disappear you could disappear they could disappear	I could be disappearing you could be disappearing he 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 he 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 he 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 couldn't disappear you couldn't disappear he couldn't disappear we couldn't disappear you couldn't disappear they couldn't disappear	I couldn't be disappearing you couldn't be disappearing he couldn't be disappearing we couldn't be disappearing you couldn't be disappearing they couldn't be disappearing
Perfect	V-ing perfect
I couldn't have disappeared you couldn't have disappeared he couldn't have disappeared we couldn't have disappeared you couldn't have disappeared they couldn't have disappeared	I couldn't have been disappearing you couldn't have been disappearing he couldn't have been disappearing we couldn't have been disappearing you couldn't have been disappearing they couldn't have been disappearing

Interrogative form

Simple form	V-ing form
could I disappear? could you disappear? could he disappear? could we disappear? could you disappear? could they disappear?	could I be disappearing? could you be disappearing? could he 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 he 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 he 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
couldn't I disappear? couldn't you disappear? couldn't he disappear? couldn't we disappear? couldn't you disappear? couldn't they disappear?	couldn't I be disappearing? couldn't you be disappearing? couldn't he be disappearing? couldn't we be disappearing? couldn't you be disappearing? couldn't they be disappearing?
Perfect	V-ing perfect
couldn't I have disappeared? couldn't you have disappeared? couldn't he have disappeared? couldn't we have disappeared? couldn't you have disappeared? couldn't they have disappeared?	couldn't I have been disappearing? couldn't you have been disappearing? couldn't he have been disappearing? couldn't we have been disappearing? couldn't you have been disappearing? couldn't they have been disappearing?