English verb conjugation
COULD INFEST

Regular verb: infest - infested - infested

Affirmation

Simple form	V-ing form
I could infest you could infest she could infest we could infest you could infest they could infest	I could be infesting you could be infesting she could be infesting we could be infesting you could be infesting they could be infesting
Perfect	V-ing perfect
I could have infested you could have infested she could have infested we could have infested you could have infested they could have infested	I could have been infesting you could have been infesting she could have been infesting we could have been infesting you could have been infesting they could have been infesting

Negation

Simple form	V-ing form
I could not infest you could not infest she could not infest we could not infest you could not infest they could not infest	I could not be infesting you could not be infesting she could not be infesting we could not be infesting you could not be infesting they could not be infesting
Perfect	V-ing perfect
I could not have infested you could not have infested she could not have infested we could not have infested you could not have infested they could not have infested	I could not have been infesting you could not have been infesting she could not have been infesting we could not have been infesting you could not have been infesting they could not have been infesting

Interrogative form

Simple form	V-ing form
could I infest? could you infest? could she infest? could we infest? could you infest? could they infest?	could I be infesting? could you be infesting? could she be infesting? could we be infesting? could you be infesting? could they be infesting?
Perfect	V-ing perfect
could I have infested? could you have infested? could she have infested? could we have infested? could you have infested? could they have infested?	could I have been infesting? could you have been infesting? could she have been infesting? could we have been infesting? could you have been infesting? could they have been infesting?

Interro-negative form

Simple form	V-ing form
could I not infest? could you not infest? could she not infest? could we not infest? could you not infest? could they not infest?	could I not be infesting? could you not be infesting? could she not be infesting? could we not be infesting? could you not be infesting? could they not be infesting?
Perfect	V-ing perfect
could I not have infested? could you not have infested? could she not have infested? could we not have infested? could you not have infested? could they not have infested?	could I not have been infesting? could you not have been infesting? could she not have been infesting? could we not have been infesting? could you not have been infesting? could they not have been infesting?