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 couldn't twine you couldn't twine he couldn't twine we couldn't twine you couldn't twine they couldn't twine	I couldn't be twining you couldn't be twining he couldn't be twining we couldn't be twining you couldn't be twining they couldn't be twining
Perfect	V-ing perfect
I couldn't have twined you couldn't have twined he couldn't have twined we couldn't have twined you couldn't have twined they couldn't have twined	I couldn't have been twining you couldn't have been twining he couldn't have been twining we couldn't have been twining you couldn't have been twining they couldn't 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
couldn't I twine? couldn't you twine? couldn't he twine? couldn't we twine? couldn't you twine? couldn't they twine?	couldn't I be twining? couldn't you be twining? couldn't he be twining? couldn't we be twining? couldn't you be twining? couldn't they be twining?
Perfect	V-ing perfect
couldn't I have twined? couldn't you have twined? couldn't he have twined? couldn't we have twined? couldn't you have twined? couldn't they have twined?	couldn't I have been twining? couldn't you have been twining? couldn't he have been twining? couldn't we have been twining? couldn't you have been twining? couldn't they have been twining?