English verb conjugation
COULD VIAL

Regular verb: vial - vialed - vialed

Affirmation

Simple form	V-ing form
I could vial you could vial he could vial we could vial you could vial they could vial	I could be vialing you could be vialing he could be vialing we could be vialing you could be vialing they could be vialing
Perfect	V-ing perfect
I could have vialed you could have vialed he could have vialed we could have vialed you could have vialed they could have vialed	I could have been vialing you could have been vialing he could have been vialing we could have been vialing you could have been vialing they could have been vialing

Negation

Simple form	V-ing form
I could not vial you could not vial he could not vial we could not vial you could not vial they could not vial	I could not be vialing you could not be vialing he could not be vialing we could not be vialing you could not be vialing they could not be vialing
Perfect	V-ing perfect
I could not have vialed you could not have vialed he could not have vialed we could not have vialed you could not have vialed they could not have vialed	I could not have been vialing you could not have been vialing he could not have been vialing we could not have been vialing you could not have been vialing they could not have been vialing

Interrogative form

Simple form	V-ing form
could I vial? could you vial? could he vial? could we vial? could you vial? could they vial?	could I be vialing? could you be vialing? could he be vialing? could we be vialing? could you be vialing? could they be vialing?
Perfect	V-ing perfect
could I have vialed? could you have vialed? could he have vialed? could we have vialed? could you have vialed? could they have vialed?	could I have been vialing? could you have been vialing? could he have been vialing? could we have been vialing? could you have been vialing? could they have been vialing?

Interro-negative form

Simple form	V-ing form
could I not vial? could you not vial? could he not vial? could we not vial? could you not vial? could they not vial?	could I not be vialing? could you not be vialing? could he not be vialing? could we not be vialing? could you not be vialing? could they not be vialing?
Perfect	V-ing perfect
could I not have vialed? could you not have vialed? could he not have vialed? could we not have vialed? could you not have vialed? could they not have vialed?	could I not have been vialing? could you not have been vialing? could he not have been vialing? could we not have been vialing? could you not have been vialing? could they not have been vialing?