English verb conjugation
COULD FLUNK

Regular verb: flunk - flunked - flunked

Affirmation

Simple form	V-ing form
I could flunk you could flunk he could flunk we could flunk you could flunk they could flunk	I could be flunking you could be flunking he could be flunking we could be flunking you could be flunking they could be flunking
Perfect	V-ing perfect
I could have flunked you could have flunked he could have flunked we could have flunked you could have flunked they could have flunked	I could have been flunking you could have been flunking he could have been flunking we could have been flunking you could have been flunking they could have been flunking

Negation

Simple form	V-ing form
I couldn't flunk you couldn't flunk he couldn't flunk we couldn't flunk you couldn't flunk they couldn't flunk	I couldn't be flunking you couldn't be flunking he couldn't be flunking we couldn't be flunking you couldn't be flunking they couldn't be flunking
Perfect	V-ing perfect
I couldn't have flunked you couldn't have flunked he couldn't have flunked we couldn't have flunked you couldn't have flunked they couldn't have flunked	I couldn't have been flunking you couldn't have been flunking he couldn't have been flunking we couldn't have been flunking you couldn't have been flunking they couldn't have been flunking

Interrogative form

Simple form	V-ing form
could I flunk? could you flunk? could he flunk? could we flunk? could you flunk? could they flunk?	could I be flunking? could you be flunking? could he be flunking? could we be flunking? could you be flunking? could they be flunking?
Perfect	V-ing perfect
could I have flunked? could you have flunked? could he have flunked? could we have flunked? could you have flunked? could they have flunked?	could I have been flunking? could you have been flunking? could he have been flunking? could we have been flunking? could you have been flunking? could they have been flunking?

Interro-negative form

Simple form	V-ing form
couldn't I flunk? couldn't you flunk? couldn't he flunk? couldn't we flunk? couldn't you flunk? couldn't they flunk?	couldn't I be flunking? couldn't you be flunking? couldn't he be flunking? couldn't we be flunking? couldn't you be flunking? couldn't they be flunking?
Perfect	V-ing perfect
couldn't I have flunked? couldn't you have flunked? couldn't he have flunked? couldn't we have flunked? couldn't you have flunked? couldn't they have flunked?	couldn't I have been flunking? couldn't you have been flunking? couldn't he have been flunking? couldn't we have been flunking? couldn't you have been flunking? couldn't they have been flunking?