English verb conjugation
COULD CONTEST

Regular verb: contest - contested - contested

Affirmation

Simple form	V-ing form
I could contest you could contest she could contest we could contest you could contest they could contest	I could be contesting you could be contesting she could be contesting we could be contesting you could be contesting they could be contesting
Perfect	V-ing perfect
I could have contested you could have contested she could have contested we could have contested you could have contested they could have contested	I could have been contesting you could have been contesting she could have been contesting we could have been contesting you could have been contesting they could have been contesting

Negation

Simple form	V-ing form
I couldn't contest you couldn't contest she couldn't contest we couldn't contest you couldn't contest they couldn't contest	I couldn't be contesting you couldn't be contesting she couldn't be contesting we couldn't be contesting you couldn't be contesting they couldn't be contesting
Perfect	V-ing perfect
I couldn't have contested you couldn't have contested she couldn't have contested we couldn't have contested you couldn't have contested they couldn't have contested	I couldn't have been contesting you couldn't have been contesting she couldn't have been contesting we couldn't have been contesting you couldn't have been contesting they couldn't have been contesting

Interrogative form

Simple form	V-ing form
could I contest? could you contest? could she contest? could we contest? could you contest? could they contest?	could I be contesting? could you be contesting? could she be contesting? could we be contesting? could you be contesting? could they be contesting?
Perfect	V-ing perfect
could I have contested? could you have contested? could she have contested? could we have contested? could you have contested? could they have contested?	could I have been contesting? could you have been contesting? could she have been contesting? could we have been contesting? could you have been contesting? could they have been contesting?

Interro-negative form

Simple form	V-ing form
couldn't I contest? couldn't you contest? couldn't she contest? couldn't we contest? couldn't you contest? couldn't they contest?	couldn't I be contesting? couldn't you be contesting? couldn't she be contesting? couldn't we be contesting? couldn't you be contesting? couldn't they be contesting?
Perfect	V-ing perfect
couldn't I have contested? couldn't you have contested? couldn't she have contested? couldn't we have contested? couldn't you have contested? couldn't they have contested?	couldn't I have been contesting? couldn't you have been contesting? couldn't she have been contesting? couldn't we have been contesting? couldn't you have been contesting? couldn't they have been contesting?