English verb conjugation
COULD DECONGEST

Regular verb: decongest - decongested - decongested

Affirmation

Simple form	V-ing form
I could decongest you could decongest he could decongest we could decongest you could decongest they could decongest	I could be decongesting you could be decongesting he could be decongesting we could be decongesting you could be decongesting they could be decongesting
Perfect	V-ing perfect
I could have decongested you could have decongested he could have decongested we could have decongested you could have decongested they could have decongested	I could have been decongesting you could have been decongesting he could have been decongesting we could have been decongesting you could have been decongesting they could have been decongesting

Negation

Simple form	V-ing form
I couldn't decongest you couldn't decongest he couldn't decongest we couldn't decongest you couldn't decongest they couldn't decongest	I couldn't be decongesting you couldn't be decongesting he couldn't be decongesting we couldn't be decongesting you couldn't be decongesting they couldn't be decongesting
Perfect	V-ing perfect
I couldn't have decongested you couldn't have decongested he couldn't have decongested we couldn't have decongested you couldn't have decongested they couldn't have decongested	I couldn't have been decongesting you couldn't have been decongesting he couldn't have been decongesting we couldn't have been decongesting you couldn't have been decongesting they couldn't have been decongesting

Interrogative form

Simple form	V-ing form
could I decongest? could you decongest? could he decongest? could we decongest? could you decongest? could they decongest?	could I be decongesting? could you be decongesting? could he be decongesting? could we be decongesting? could you be decongesting? could they be decongesting?
Perfect	V-ing perfect
could I have decongested? could you have decongested? could he have decongested? could we have decongested? could you have decongested? could they have decongested?	could I have been decongesting? could you have been decongesting? could he have been decongesting? could we have been decongesting? could you have been decongesting? could they have been decongesting?

Interro-negative form

Simple form	V-ing form
couldn't I decongest? couldn't you decongest? couldn't he decongest? couldn't we decongest? couldn't you decongest? couldn't they decongest?	couldn't I be decongesting? couldn't you be decongesting? couldn't he be decongesting? couldn't we be decongesting? couldn't you be decongesting? couldn't they be decongesting?
Perfect	V-ing perfect
couldn't I have decongested? couldn't you have decongested? couldn't he have decongested? couldn't we have decongested? couldn't you have decongested? couldn't they have decongested?	couldn't I have been decongesting? couldn't you have been decongesting? couldn't he have been decongesting? couldn't we have been decongesting? couldn't you have been decongesting? couldn't they have been decongesting?