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 couldn't oyster you couldn't oyster he couldn't oyster we couldn't oyster you couldn't oyster they couldn't oyster	I couldn't be oystering you couldn't be oystering he couldn't be oystering we couldn't be oystering you couldn't be oystering they couldn't be oystering
Perfect	V-ing perfect
I couldn't have oystered you couldn't have oystered he couldn't have oystered we couldn't have oystered you couldn't have oystered they couldn't have oystered	I couldn't have been oystering you couldn't have been oystering he couldn't have been oystering we couldn't have been oystering you couldn't have been oystering they couldn't 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
couldn't I oyster? couldn't you oyster? couldn't he oyster? couldn't we oyster? couldn't you oyster? couldn't they oyster?	couldn't I be oystering? couldn't you be oystering? couldn't he be oystering? couldn't we be oystering? couldn't you be oystering? couldn't they be oystering?
Perfect	V-ing perfect
couldn't I have oystered? couldn't you have oystered? couldn't he have oystered? couldn't we have oystered? couldn't you have oystered? couldn't they have oystered?	couldn't I have been oystering? couldn't you have been oystering? couldn't he have been oystering? couldn't we have been oystering? couldn't you have been oystering? couldn't they have been oystering?