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 couldn't vial you couldn't vial he couldn't vial we couldn't vial you couldn't vial they couldn't vial	I couldn't be vialing you couldn't be vialing he couldn't be vialing we couldn't be vialing you couldn't be vialing they couldn't be vialing
Perfect	V-ing perfect
I couldn't have vialed you couldn't have vialed he couldn't have vialed we couldn't have vialed you couldn't have vialed they couldn't have vialed	I couldn't have been vialing you couldn't have been vialing he couldn't have been vialing we couldn't have been vialing you couldn't have been vialing they couldn't 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
couldn't I vial? couldn't you vial? couldn't he vial? couldn't we vial? couldn't you vial? couldn't they vial?	couldn't I be vialing? couldn't you be vialing? couldn't he be vialing? couldn't we be vialing? couldn't you be vialing? couldn't they be vialing?
Perfect	V-ing perfect
couldn't I have vialed? couldn't you have vialed? couldn't he have vialed? couldn't we have vialed? couldn't you have vialed? couldn't they have vialed?	couldn't I have been vialing? couldn't you have been vialing? couldn't he have been vialing? couldn't we have been vialing? couldn't you have been vialing? couldn't they have been vialing?