English verb conjugation
COULD VEX

Regular verb: vex - vexed - vexed

Affirmation

Simple form	V-ing form
I could vex you could vex he could vex we could vex you could vex they could vex	I could be vexing you could be vexing he could be vexing we could be vexing you could be vexing they could be vexing
Perfect	V-ing perfect
I could have vexed you could have vexed he could have vexed we could have vexed you could have vexed they could have vexed	I could have been vexing you could have been vexing he could have been vexing we could have been vexing you could have been vexing they could have been vexing

Negation

Simple form	V-ing form
I couldn't vex you couldn't vex he couldn't vex we couldn't vex you couldn't vex they couldn't vex	I couldn't be vexing you couldn't be vexing he couldn't be vexing we couldn't be vexing you couldn't be vexing they couldn't be vexing
Perfect	V-ing perfect
I couldn't have vexed you couldn't have vexed he couldn't have vexed we couldn't have vexed you couldn't have vexed they couldn't have vexed	I couldn't have been vexing you couldn't have been vexing he couldn't have been vexing we couldn't have been vexing you couldn't have been vexing they couldn't have been vexing

Interrogative form

Simple form	V-ing form
could I vex? could you vex? could he vex? could we vex? could you vex? could they vex?	could I be vexing? could you be vexing? could he be vexing? could we be vexing? could you be vexing? could they be vexing?
Perfect	V-ing perfect
could I have vexed? could you have vexed? could he have vexed? could we have vexed? could you have vexed? could they have vexed?	could I have been vexing? could you have been vexing? could he have been vexing? could we have been vexing? could you have been vexing? could they have been vexing?

Interro-negative form

Simple form	V-ing form
couldn't I vex? couldn't you vex? couldn't he vex? couldn't we vex? couldn't you vex? couldn't they vex?	couldn't I be vexing? couldn't you be vexing? couldn't he be vexing? couldn't we be vexing? couldn't you be vexing? couldn't they be vexing?
Perfect	V-ing perfect
couldn't I have vexed? couldn't you have vexed? couldn't he have vexed? couldn't we have vexed? couldn't you have vexed? couldn't they have vexed?	couldn't I have been vexing? couldn't you have been vexing? couldn't he have been vexing? couldn't we have been vexing? couldn't you have been vexing? couldn't they have been vexing?