English verb conjugation
COULD VEIN

Regular verb: vein - veined - veined

Affirmation

Simple form	V-ing form
I could vein you could vein he could vein we could vein you could vein they could vein	I could be veining you could be veining he could be veining we could be veining you could be veining they could be veining
Perfect	V-ing perfect
I could have veined you could have veined he could have veined we could have veined you could have veined they could have veined	I could have been veining you could have been veining he could have been veining we could have been veining you could have been veining they could have been veining

Negation

Simple form	V-ing form
I couldn't vein you couldn't vein he couldn't vein we couldn't vein you couldn't vein they couldn't vein	I couldn't be veining you couldn't be veining he couldn't be veining we couldn't be veining you couldn't be veining they couldn't be veining
Perfect	V-ing perfect
I couldn't have veined you couldn't have veined he couldn't have veined we couldn't have veined you couldn't have veined they couldn't have veined	I couldn't have been veining you couldn't have been veining he couldn't have been veining we couldn't have been veining you couldn't have been veining they couldn't have been veining

Interrogative form

Simple form	V-ing form
could I vein? could you vein? could he vein? could we vein? could you vein? could they vein?	could I be veining? could you be veining? could he be veining? could we be veining? could you be veining? could they be veining?
Perfect	V-ing perfect
could I have veined? could you have veined? could he have veined? could we have veined? could you have veined? could they have veined?	could I have been veining? could you have been veining? could he have been veining? could we have been veining? could you have been veining? could they have been veining?

Interro-negative form

Simple form	V-ing form
couldn't I vein? couldn't you vein? couldn't he vein? couldn't we vein? couldn't you vein? couldn't they vein?	couldn't I be veining? couldn't you be veining? couldn't he be veining? couldn't we be veining? couldn't you be veining? couldn't they be veining?
Perfect	V-ing perfect
couldn't I have veined? couldn't you have veined? couldn't he have veined? couldn't we have veined? couldn't you have veined? couldn't they have veined?	couldn't I have been veining? couldn't you have been veining? couldn't he have been veining? couldn't we have been veining? couldn't you have been veining? couldn't they have been veining?