English verb conjugation
COULD AUCTION

Regular verb: auction - auctioned - auctioned

Affirmation

Simple form	V-ing form
I could auction you could auction she could auction we could auction you could auction they could auction	I could be auctioning you could be auctioning she could be auctioning we could be auctioning you could be auctioning they could be auctioning
Perfect	V-ing perfect
I could have auctioned you could have auctioned she could have auctioned we could have auctioned you could have auctioned they could have auctioned	I could have been auctioning you could have been auctioning she could have been auctioning we could have been auctioning you could have been auctioning they could have been auctioning

Negation

Simple form	V-ing form
I couldn't auction you couldn't auction she couldn't auction we couldn't auction you couldn't auction they couldn't auction	I couldn't be auctioning you couldn't be auctioning she couldn't be auctioning we couldn't be auctioning you couldn't be auctioning they couldn't be auctioning
Perfect	V-ing perfect
I couldn't have auctioned you couldn't have auctioned she couldn't have auctioned we couldn't have auctioned you couldn't have auctioned they couldn't have auctioned	I couldn't have been auctioning you couldn't have been auctioning she couldn't have been auctioning we couldn't have been auctioning you couldn't have been auctioning they couldn't have been auctioning

Interrogative form

Simple form	V-ing form
could I auction? could you auction? could she auction? could we auction? could you auction? could they auction?	could I be auctioning? could you be auctioning? could she be auctioning? could we be auctioning? could you be auctioning? could they be auctioning?
Perfect	V-ing perfect
could I have auctioned? could you have auctioned? could she have auctioned? could we have auctioned? could you have auctioned? could they have auctioned?	could I have been auctioning? could you have been auctioning? could she have been auctioning? could we have been auctioning? could you have been auctioning? could they have been auctioning?

Interro-negative form

Simple form	V-ing form
couldn't I auction? couldn't you auction? couldn't she auction? couldn't we auction? couldn't you auction? couldn't they auction?	couldn't I be auctioning? couldn't you be auctioning? couldn't she be auctioning? couldn't we be auctioning? couldn't you be auctioning? couldn't they be auctioning?
Perfect	V-ing perfect
couldn't I have auctioned? couldn't you have auctioned? couldn't she have auctioned? couldn't we have auctioned? couldn't you have auctioned? couldn't they have auctioned?	couldn't I have been auctioning? couldn't you have been auctioning? couldn't she have been auctioning? couldn't we have been auctioning? couldn't you have been auctioning? couldn't they have been auctioning?