English verb conjugation
COULD OYSTER

Regular verb: oyster - oystered - oystered

Affirmation

Simple form	V-ing form
I could oyster you could oyster he could oyster we could oyster you could oyster they could oyster	I could be oystering you could be oystering he could be oystering we could be oystering you could be oystering they could be oystering
Perfect	V-ing perfect
I could have oystered you could have oystered he could have oystered we could have oystered you could have oystered they could have oystered	I could have been oystering you could have been oystering he could have been oystering we could have been oystering you could have been oystering they could have been oystering

Negation

Simple form	V-ing form
I could not oyster you could not oyster he could not oyster we could not oyster you could not oyster they could not oyster	I could not be oystering you could not be oystering he could not be oystering we could not be oystering you could not be oystering they could not be oystering
Perfect	V-ing perfect
I could not have oystered you could not have oystered he could not have oystered we could not have oystered you could not have oystered they could not have oystered	I could not have been oystering you could not have been oystering he could not have been oystering we could not have been oystering you could not have been oystering they could not have been oystering

Interrogative form

Simple form	V-ing form
could I oyster? could you oyster? could he oyster? could we oyster? could you oyster? could they oyster?	could I be oystering? could you be oystering? could he be oystering? could we be oystering? could you be oystering? could they be oystering?
Perfect	V-ing perfect
could I have oystered? could you have oystered? could he have oystered? could we have oystered? could you have oystered? could they have oystered?	could I have been oystering? could you have been oystering? could he have been oystering? could we have been oystering? could you have been oystering? could they have been oystering?

Interro-negative form

Simple form	V-ing form
could I not oyster? could you not oyster? could he not oyster? could we not oyster? could you not oyster? could they not oyster?	could I not be oystering? could you not be oystering? could he not be oystering? could we not be oystering? could you not be oystering? could they not be oystering?
Perfect	V-ing perfect
could I not have oystered? could you not have oystered? could he not have oystered? could we not have oystered? could you not have oystered? could they not have oystered?	could I not have been oystering? could you not have been oystering? could he not have been oystering? could we not have been oystering? could you not have been oystering? could they not have been oystering?