English verb conjugation
COULD SEINE

Regular verb: seine - seined - seined

Affirmation

Simple form	V-ing form
I could seine you could seine he could seine we could seine you could seine they could seine	I could be seining you could be seining he could be seining we could be seining you could be seining they could be seining
Perfect	V-ing perfect
I could have seined you could have seined he could have seined we could have seined you could have seined they could have seined	I could have been seining you could have been seining he could have been seining we could have been seining you could have been seining they could have been seining

Negation

Simple form	V-ing form
I could not seine you could not seine he could not seine we could not seine you could not seine they could not seine	I could not be seining you could not be seining he could not be seining we could not be seining you could not be seining they could not be seining
Perfect	V-ing perfect
I could not have seined you could not have seined he could not have seined we could not have seined you could not have seined they could not have seined	I could not have been seining you could not have been seining he could not have been seining we could not have been seining you could not have been seining they could not have been seining

Interrogative form

Simple form	V-ing form
could I seine? could you seine? could he seine? could we seine? could you seine? could they seine?	could I be seining? could you be seining? could he be seining? could we be seining? could you be seining? could they be seining?
Perfect	V-ing perfect
could I have seined? could you have seined? could he have seined? could we have seined? could you have seined? could they have seined?	could I have been seining? could you have been seining? could he have been seining? could we have been seining? could you have been seining? could they have been seining?

Interro-negative form

Simple form	V-ing form
could I not seine? could you not seine? could he not seine? could we not seine? could you not seine? could they not seine?	could I not be seining? could you not be seining? could he not be seining? could we not be seining? could you not be seining? could they not be seining?
Perfect	V-ing perfect
could I not have seined? could you not have seined? could he not have seined? could we not have seined? could you not have seined? could they not have seined?	could I not have been seining? could you not have been seining? could he not have been seining? could we not have been seining? could you not have been seining? could they not have been seining?