English verb conjugation
COULD PUTTER

Regular verb: putter - puttered - puttered

Affirmation

Simple form	V-ing form
I could putter you could putter he could putter we could putter you could putter they could putter	I could be puttering you could be puttering he could be puttering we could be puttering you could be puttering they could be puttering
Perfect	V-ing perfect
I could have puttered you could have puttered he could have puttered we could have puttered you could have puttered they could have puttered	I could have been puttering you could have been puttering he could have been puttering we could have been puttering you could have been puttering they could have been puttering

Negation

Simple form	V-ing form
I could not putter you could not putter he could not putter we could not putter you could not putter they could not putter	I could not be puttering you could not be puttering he could not be puttering we could not be puttering you could not be puttering they could not be puttering
Perfect	V-ing perfect
I could not have puttered you could not have puttered he could not have puttered we could not have puttered you could not have puttered they could not have puttered	I could not have been puttering you could not have been puttering he could not have been puttering we could not have been puttering you could not have been puttering they could not have been puttering

Interrogative form

Simple form	V-ing form
could I putter? could you putter? could he putter? could we putter? could you putter? could they putter?	could I be puttering? could you be puttering? could he be puttering? could we be puttering? could you be puttering? could they be puttering?
Perfect	V-ing perfect
could I have puttered? could you have puttered? could he have puttered? could we have puttered? could you have puttered? could they have puttered?	could I have been puttering? could you have been puttering? could he have been puttering? could we have been puttering? could you have been puttering? could they have been puttering?

Interro-negative form

Simple form	V-ing form
could I not putter? could you not putter? could he not putter? could we not putter? could you not putter? could they not putter?	could I not be puttering? could you not be puttering? could he not be puttering? could we not be puttering? could you not be puttering? could they not be puttering?
Perfect	V-ing perfect
could I not have puttered? could you not have puttered? could he not have puttered? could we not have puttered? could you not have puttered? could they not have puttered?	could I not have been puttering? could you not have been puttering? could he not have been puttering? could we not have been puttering? could you not have been puttering? could they not have been puttering?