English verb conjugation
COULD GIBBER

Regular verb: gibber - gibbered - gibbered

Affirmation

Simple form	V-ing form
I could gibber you could gibber he could gibber we could gibber you could gibber they could gibber	I could be gibbering you could be gibbering he could be gibbering we could be gibbering you could be gibbering they could be gibbering
Perfect	V-ing perfect
I could have gibbered you could have gibbered he could have gibbered we could have gibbered you could have gibbered they could have gibbered	I could have been gibbering you could have been gibbering he could have been gibbering we could have been gibbering you could have been gibbering they could have been gibbering

Negation

Simple form	V-ing form
I couldn't gibber you couldn't gibber he couldn't gibber we couldn't gibber you couldn't gibber they couldn't gibber	I couldn't be gibbering you couldn't be gibbering he couldn't be gibbering we couldn't be gibbering you couldn't be gibbering they couldn't be gibbering
Perfect	V-ing perfect
I couldn't have gibbered you couldn't have gibbered he couldn't have gibbered we couldn't have gibbered you couldn't have gibbered they couldn't have gibbered	I couldn't have been gibbering you couldn't have been gibbering he couldn't have been gibbering we couldn't have been gibbering you couldn't have been gibbering they couldn't have been gibbering

Interrogative form

Simple form	V-ing form
could I gibber? could you gibber? could he gibber? could we gibber? could you gibber? could they gibber?	could I be gibbering? could you be gibbering? could he be gibbering? could we be gibbering? could you be gibbering? could they be gibbering?
Perfect	V-ing perfect
could I have gibbered? could you have gibbered? could he have gibbered? could we have gibbered? could you have gibbered? could they have gibbered?	could I have been gibbering? could you have been gibbering? could he have been gibbering? could we have been gibbering? could you have been gibbering? could they have been gibbering?

Interro-negative form

Simple form	V-ing form
couldn't I gibber? couldn't you gibber? couldn't he gibber? couldn't we gibber? couldn't you gibber? couldn't they gibber?	couldn't I be gibbering? couldn't you be gibbering? couldn't he be gibbering? couldn't we be gibbering? couldn't you be gibbering? couldn't they be gibbering?
Perfect	V-ing perfect
couldn't I have gibbered? couldn't you have gibbered? couldn't he have gibbered? couldn't we have gibbered? couldn't you have gibbered? couldn't they have gibbered?	couldn't I have been gibbering? couldn't you have been gibbering? couldn't he have been gibbering? couldn't we have been gibbering? couldn't you have been gibbering? couldn't they have been gibbering?