English verb conjugation
COULD CEIL

Regular verb: ceil - ceiled - ceiled

Affirmation

Simple form	V-ing form
I could ceil you could ceil she could ceil we could ceil you could ceil they could ceil	I could be ceiling you could be ceiling she could be ceiling we could be ceiling you could be ceiling they could be ceiling
Perfect	V-ing perfect
I could have ceiled you could have ceiled she could have ceiled we could have ceiled you could have ceiled they could have ceiled	I could have been ceiling you could have been ceiling she could have been ceiling we could have been ceiling you could have been ceiling they could have been ceiling

Negation

Simple form	V-ing form
I could not ceil you could not ceil she could not ceil we could not ceil you could not ceil they could not ceil	I could not be ceiling you could not be ceiling she could not be ceiling we could not be ceiling you could not be ceiling they could not be ceiling
Perfect	V-ing perfect
I could not have ceiled you could not have ceiled she could not have ceiled we could not have ceiled you could not have ceiled they could not have ceiled	I could not have been ceiling you could not have been ceiling she could not have been ceiling we could not have been ceiling you could not have been ceiling they could not have been ceiling

Interrogative form

Simple form	V-ing form
could I ceil? could you ceil? could she ceil? could we ceil? could you ceil? could they ceil?	could I be ceiling? could you be ceiling? could she be ceiling? could we be ceiling? could you be ceiling? could they be ceiling?
Perfect	V-ing perfect
could I have ceiled? could you have ceiled? could she have ceiled? could we have ceiled? could you have ceiled? could they have ceiled?	could I have been ceiling? could you have been ceiling? could she have been ceiling? could we have been ceiling? could you have been ceiling? could they have been ceiling?

Interro-negative form

Simple form	V-ing form
could I not ceil? could you not ceil? could she not ceil? could we not ceil? could you not ceil? could they not ceil?	could I not be ceiling? could you not be ceiling? could she not be ceiling? could we not be ceiling? could you not be ceiling? could they not be ceiling?
Perfect	V-ing perfect
could I not have ceiled? could you not have ceiled? could she not have ceiled? could we not have ceiled? could you not have ceiled? could they not have ceiled?	could I not have been ceiling? could you not have been ceiling? could she not have been ceiling? could we not have been ceiling? could you not have been ceiling? could they not have been ceiling?