English verb conjugation
COULD JITTER

Regular verb: jitter - jittered - jittered

Affirmation

Simple form	V-ing form
I could jitter you could jitter he could jitter we could jitter you could jitter they could jitter	I could be jittering you could be jittering he could be jittering we could be jittering you could be jittering they could be jittering
Perfect	V-ing perfect
I could have jittered you could have jittered he could have jittered we could have jittered you could have jittered they could have jittered	I could have been jittering you could have been jittering he could have been jittering we could have been jittering you could have been jittering they could have been jittering

Negation

Simple form	V-ing form
I couldn't jitter you couldn't jitter he couldn't jitter we couldn't jitter you couldn't jitter they couldn't jitter	I couldn't be jittering you couldn't be jittering he couldn't be jittering we couldn't be jittering you couldn't be jittering they couldn't be jittering
Perfect	V-ing perfect
I couldn't have jittered you couldn't have jittered he couldn't have jittered we couldn't have jittered you couldn't have jittered they couldn't have jittered	I couldn't have been jittering you couldn't have been jittering he couldn't have been jittering we couldn't have been jittering you couldn't have been jittering they couldn't have been jittering

Interrogative form

Simple form	V-ing form
could I jitter? could you jitter? could he jitter? could we jitter? could you jitter? could they jitter?	could I be jittering? could you be jittering? could he be jittering? could we be jittering? could you be jittering? could they be jittering?
Perfect	V-ing perfect
could I have jittered? could you have jittered? could he have jittered? could we have jittered? could you have jittered? could they have jittered?	could I have been jittering? could you have been jittering? could he have been jittering? could we have been jittering? could you have been jittering? could they have been jittering?

Interro-negative form

Simple form	V-ing form
couldn't I jitter? couldn't you jitter? couldn't he jitter? couldn't we jitter? couldn't you jitter? couldn't they jitter?	couldn't I be jittering? couldn't you be jittering? couldn't he be jittering? couldn't we be jittering? couldn't you be jittering? couldn't they be jittering?
Perfect	V-ing perfect
couldn't I have jittered? couldn't you have jittered? couldn't he have jittered? couldn't we have jittered? couldn't you have jittered? couldn't they have jittered?	couldn't I have been jittering? couldn't you have been jittering? couldn't he have been jittering? couldn't we have been jittering? couldn't you have been jittering? couldn't they have been jittering?