English verb conjugation
COULD CENTER

Regular verb: center - centered - centered

Affirmation

Simple form	V-ing form
I could center you could center he could center we could center you could center they could center	I could be centering you could be centering he could be centering we could be centering you could be centering they could be centering
Perfect	V-ing perfect
I could have centered you could have centered he could have centered we could have centered you could have centered they could have centered	I could have been centering you could have been centering he could have been centering we could have been centering you could have been centering they could have been centering

Negation

Simple form	V-ing form
I couldn't center you couldn't center he couldn't center we couldn't center you couldn't center they couldn't center	I couldn't be centering you couldn't be centering he couldn't be centering we couldn't be centering you couldn't be centering they couldn't be centering
Perfect	V-ing perfect
I couldn't have centered you couldn't have centered he couldn't have centered we couldn't have centered you couldn't have centered they couldn't have centered	I couldn't have been centering you couldn't have been centering he couldn't have been centering we couldn't have been centering you couldn't have been centering they couldn't have been centering

Interrogative form

Simple form	V-ing form
could I center? could you center? could he center? could we center? could you center? could they center?	could I be centering? could you be centering? could he be centering? could we be centering? could you be centering? could they be centering?
Perfect	V-ing perfect
could I have centered? could you have centered? could he have centered? could we have centered? could you have centered? could they have centered?	could I have been centering? could you have been centering? could he have been centering? could we have been centering? could you have been centering? could they have been centering?

Interro-negative form

Simple form	V-ing form
couldn't I center? couldn't you center? couldn't he center? couldn't we center? couldn't you center? couldn't they center?	couldn't I be centering? couldn't you be centering? couldn't he be centering? couldn't we be centering? couldn't you be centering? couldn't they be centering?
Perfect	V-ing perfect
couldn't I have centered? couldn't you have centered? couldn't he have centered? couldn't we have centered? couldn't you have centered? couldn't they have centered?	couldn't I have been centering? couldn't you have been centering? couldn't he have been centering? couldn't we have been centering? couldn't you have been centering? couldn't they have been centering?