English verb conjugation
COULD CREASE

Regular verb: crease - creased - creased

Affirmation

Simple form	V-ing form
I could crease you could crease he could crease we could crease you could crease they could crease	I could be creasing you could be creasing he could be creasing we could be creasing you could be creasing they could be creasing
Perfect	V-ing perfect
I could have creased you could have creased he could have creased we could have creased you could have creased they could have creased	I could have been creasing you could have been creasing he could have been creasing we could have been creasing you could have been creasing they could have been creasing

Negation

Simple form	V-ing form
I could not crease you could not crease he could not crease we could not crease you could not crease they could not crease	I could not be creasing you could not be creasing he could not be creasing we could not be creasing you could not be creasing they could not be creasing
Perfect	V-ing perfect
I could not have creased you could not have creased he could not have creased we could not have creased you could not have creased they could not have creased	I could not have been creasing you could not have been creasing he could not have been creasing we could not have been creasing you could not have been creasing they could not have been creasing

Interrogative form

Simple form	V-ing form
could I crease? could you crease? could he crease? could we crease? could you crease? could they crease?	could I be creasing? could you be creasing? could he be creasing? could we be creasing? could you be creasing? could they be creasing?
Perfect	V-ing perfect
could I have creased? could you have creased? could he have creased? could we have creased? could you have creased? could they have creased?	could I have been creasing? could you have been creasing? could he have been creasing? could we have been creasing? could you have been creasing? could they have been creasing?

Interro-negative form

Simple form	V-ing form
could I not crease? could you not crease? could he not crease? could we not crease? could you not crease? could they not crease?	could I not be creasing? could you not be creasing? could he not be creasing? could we not be creasing? could you not be creasing? could they not be creasing?
Perfect	V-ing perfect
could I not have creased? could you not have creased? could he not have creased? could we not have creased? could you not have creased? could they not have creased?	could I not have been creasing? could you not have been creasing? could he not have been creasing? could we not have been creasing? could you not have been creasing? could they not have been creasing?