English verb conjugation
COULD TWINE

Regular verb: twine - twined - twined

Affirmation

Simple form	V-ing form
I could twine you could twine she could twine we could twine you could twine they could twine	I could be twining you could be twining she could be twining we could be twining you could be twining they could be twining
Perfect	V-ing perfect
I could have twined you could have twined she could have twined we could have twined you could have twined they could have twined	I could have been twining you could have been twining she could have been twining we could have been twining you could have been twining they could have been twining

Negation

Simple form	V-ing form
I could not twine you could not twine she could not twine we could not twine you could not twine they could not twine	I could not be twining you could not be twining she could not be twining we could not be twining you could not be twining they could not be twining
Perfect	V-ing perfect
I could not have twined you could not have twined she could not have twined we could not have twined you could not have twined they could not have twined	I could not have been twining you could not have been twining she could not have been twining we could not have been twining you could not have been twining they could not have been twining

Interrogative form

Simple form	V-ing form
could I twine? could you twine? could she twine? could we twine? could you twine? could they twine?	could I be twining? could you be twining? could she be twining? could we be twining? could you be twining? could they be twining?
Perfect	V-ing perfect
could I have twined? could you have twined? could she have twined? could we have twined? could you have twined? could they have twined?	could I have been twining? could you have been twining? could she have been twining? could we have been twining? could you have been twining? could they have been twining?

Interro-negative form

Simple form	V-ing form
could I not twine? could you not twine? could she not twine? could we not twine? could you not twine? could they not twine?	could I not be twining? could you not be twining? could she not be twining? could we not be twining? could you not be twining? could they not be twining?
Perfect	V-ing perfect
could I not have twined? could you not have twined? could she not have twined? could we not have twined? could you not have twined? could they not have twined?	could I not have been twining? could you not have been twining? could she not have been twining? could we not have been twining? could you not have been twining? could they not have been twining?