English verb conjugation
COULD UNDERWORK

Regular verb: underwork - underworked - underworked

Affirmation

Simple form	V-ing form
I could underwork you could underwork he could underwork we could underwork you could underwork they could underwork	I could be underworking you could be underworking he 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 he 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 he 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 he 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 he 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 he 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 he 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 he underwork? could we underwork? could you underwork? could they underwork?	could I be underworking? could you be underworking? could he 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 he 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 he 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 he 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 he 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 he 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 he have been underworking? couldn't we have been underworking? couldn't you have been underworking? couldn't they have been underworking?