English verb conjugation
COULD TWINE

Regular verb: twine - twined - twined

Affirmation

Simple form	V-ing form
I could twine you could twine he could twine we could twine you could twine they could twine	I could be twining you could be twining he 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 he 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 he 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 he 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 he 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 he 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 he 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 he twine? could we twine? could you twine? could they twine?	could I be twining? could you be twining? could he 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 he 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 he 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 he 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 he 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 he 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 he not have been twining? could we not have been twining? could you not have been twining? could they not have been twining?