English verb conjugation
COULD INFEST

Regular verb: infest - infested - infested

Affirmation

Simple form	V-ing form
I could infest you could infest he could infest we could infest you could infest they could infest	I could be infesting you could be infesting he 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 he 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 he 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 couldn't infest you couldn't infest he couldn't infest we couldn't infest you couldn't infest they couldn't infest	I couldn't be infesting you couldn't be infesting he couldn't be infesting we couldn't be infesting you couldn't be infesting they couldn't be infesting
Perfect	V-ing perfect
I couldn't have infested you couldn't have infested he couldn't have infested we couldn't have infested you couldn't have infested they couldn't have infested	I couldn't have been infesting you couldn't have been infesting he couldn't have been infesting we couldn't have been infesting you couldn't have been infesting they couldn't have been infesting

Interrogative form

Simple form	V-ing form
could I infest? could you infest? could he infest? could we infest? could you infest? could they infest?	could I be infesting? could you be infesting? could he 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 he 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 he 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
couldn't I infest? couldn't you infest? couldn't he infest? couldn't we infest? couldn't you infest? couldn't they infest?	couldn't I be infesting? couldn't you be infesting? couldn't he be infesting? couldn't we be infesting? couldn't you be infesting? couldn't they be infesting?
Perfect	V-ing perfect
couldn't I have infested? couldn't you have infested? couldn't he have infested? couldn't we have infested? couldn't you have infested? couldn't they have infested?	couldn't I have been infesting? couldn't you have been infesting? couldn't he have been infesting? couldn't we have been infesting? couldn't you have been infesting? couldn't they have been infesting?