English verb conjugation
COULD BEST

Regular verb: best - bested - bested

Affirmation

Simple form	V-ing form
I could best you could best he could best we could best you could best they could best	I could be besting you could be besting he could be besting we could be besting you could be besting they could be besting
Perfect	V-ing perfect
I could have bested you could have bested he could have bested we could have bested you could have bested they could have bested	I could have been besting you could have been besting he could have been besting we could have been besting you could have been besting they could have been besting

Negation

Simple form	V-ing form
I couldn't best you couldn't best he couldn't best we couldn't best you couldn't best they couldn't best	I couldn't be besting you couldn't be besting he couldn't be besting we couldn't be besting you couldn't be besting they couldn't be besting
Perfect	V-ing perfect
I couldn't have bested you couldn't have bested he couldn't have bested we couldn't have bested you couldn't have bested they couldn't have bested	I couldn't have been besting you couldn't have been besting he couldn't have been besting we couldn't have been besting you couldn't have been besting they couldn't have been besting

Interrogative form

Simple form	V-ing form
could I best? could you best? could he best? could we best? could you best? could they best?	could I be besting? could you be besting? could he be besting? could we be besting? could you be besting? could they be besting?
Perfect	V-ing perfect
could I have bested? could you have bested? could he have bested? could we have bested? could you have bested? could they have bested?	could I have been besting? could you have been besting? could he have been besting? could we have been besting? could you have been besting? could they have been besting?

Interro-negative form

Simple form	V-ing form
couldn't I best? couldn't you best? couldn't he best? couldn't we best? couldn't you best? couldn't they best?	couldn't I be besting? couldn't you be besting? couldn't he be besting? couldn't we be besting? couldn't you be besting? couldn't they be besting?
Perfect	V-ing perfect
couldn't I have bested? couldn't you have bested? couldn't he have bested? couldn't we have bested? couldn't you have bested? couldn't they have bested?	couldn't I have been besting? couldn't you have been besting? couldn't he have been besting? couldn't we have been besting? couldn't you have been besting? couldn't they have been besting?