English verb conjugation
COULD UNDERBID

Irregular verb: underbid - underbid - underbid

Affirmation

Simple form	V-ing form
I could underbid you could underbid he could underbid we could underbid you could underbid they could underbid	I could be underbidding you could be underbidding he could be underbidding we could be underbidding you could be underbidding they could be underbidding
Perfect	V-ing perfect
I could have underbid you could have underbid he could have underbid we could have underbid you could have underbid they could have underbid	I could have been underbidding you could have been underbidding he could have been underbidding we could have been underbidding you could have been underbidding they could have been underbidding

Negation

Simple form	V-ing form
I couldn't underbid you couldn't underbid he couldn't underbid we couldn't underbid you couldn't underbid they couldn't underbid	I couldn't be underbidding you couldn't be underbidding he couldn't be underbidding we couldn't be underbidding you couldn't be underbidding they couldn't be underbidding
Perfect	V-ing perfect
I couldn't have underbid you couldn't have underbid he couldn't have underbid we couldn't have underbid you couldn't have underbid they couldn't have underbid	I couldn't have been underbidding you couldn't have been underbidding he couldn't have been underbidding we couldn't have been underbidding you couldn't have been underbidding they couldn't have been underbidding

Interrogative form

Simple form	V-ing form
could I underbid? could you underbid? could he underbid? could we underbid? could you underbid? could they underbid?	could I be underbidding? could you be underbidding? could he be underbidding? could we be underbidding? could you be underbidding? could they be underbidding?
Perfect	V-ing perfect
could I have underbid? could you have underbid? could he have underbid? could we have underbid? could you have underbid? could they have underbid?	could I have been underbidding? could you have been underbidding? could he have been underbidding? could we have been underbidding? could you have been underbidding? could they have been underbidding?

Interro-negative form

Simple form	V-ing form
couldn't I underbid? couldn't you underbid? couldn't he underbid? couldn't we underbid? couldn't you underbid? couldn't they underbid?	couldn't I be underbidding? couldn't you be underbidding? couldn't he be underbidding? couldn't we be underbidding? couldn't you be underbidding? couldn't they be underbidding?
Perfect	V-ing perfect
couldn't I have underbid? couldn't you have underbid? couldn't he have underbid? couldn't we have underbid? couldn't you have underbid? couldn't they have underbid?	couldn't I have been underbidding? couldn't you have been underbidding? couldn't he have been underbidding? couldn't we have been underbidding? couldn't you have been underbidding? couldn't they have been underbidding?