English verb conjugation
COULD UNDERWORK

Regular verb: underwork - underworked - underworked

Affirmation

Simple form	V-ing form
I could underwork you could underwork she could underwork we could underwork you could underwork they could underwork	I could be underworking you could be underworking she could be underworking we could be underworking you could be underworking they could be underworking
Perfect	V-ing perfect
I could have underworked you could have underworked she could have underworked we could have underworked you could have underworked they could have underworked	I could have been underworking you could have been underworking she could have been underworking we could have been underworking you could have been underworking they could have been underworking

Negation

Simple form	V-ing form
I couldn't underwork you couldn't underwork she couldn't underwork we couldn't underwork you couldn't underwork they couldn't underwork	I couldn't be underworking you couldn't be underworking she couldn't be underworking we couldn't be underworking you couldn't be underworking they couldn't be underworking
Perfect	V-ing perfect
I couldn't have underworked you couldn't have underworked she couldn't have underworked we couldn't have underworked you couldn't have underworked they couldn't have underworked	I couldn't have been underworking you couldn't have been underworking she couldn't have been underworking we couldn't have been underworking you couldn't have been underworking they couldn't have been underworking

Interrogative form

Simple form	V-ing form
could I underwork? could you underwork? could she underwork? could we underwork? could you underwork? could they underwork?	could I be underworking? could you be underworking? could she be underworking? could we be underworking? could you be underworking? could they be underworking?
Perfect	V-ing perfect
could I have underworked? could you have underworked? could she have underworked? could we have underworked? could you have underworked? could they have underworked?	could I have been underworking? could you have been underworking? could she have been underworking? could we have been underworking? could you have been underworking? could they have been underworking?

Interro-negative form

Simple form	V-ing form
couldn't I underwork? couldn't you underwork? couldn't she underwork? couldn't we underwork? couldn't you underwork? couldn't they underwork?	couldn't I be underworking? couldn't you be underworking? couldn't she be underworking? couldn't we be underworking? couldn't you be underworking? couldn't they be underworking?
Perfect	V-ing perfect
couldn't I have underworked? couldn't you have underworked? couldn't she have underworked? couldn't we have underworked? couldn't you have underworked? couldn't they have underworked?	couldn't I have been underworking? couldn't you have been underworking? couldn't she have been underworking? couldn't we have been underworking? couldn't you have been underworking? couldn't they have been underworking?