English verb conjugation
COULD JOINT

Regular verb: joint - jointed - jointed

Affirmation

Simple form	V-ing form
I could joint you could joint he could joint we could joint you could joint they could joint	I could be jointing you could be jointing he could be jointing we could be jointing you could be jointing they could be jointing
Perfect	V-ing perfect
I could have jointed you could have jointed he could have jointed we could have jointed you could have jointed they could have jointed	I could have been jointing you could have been jointing he could have been jointing we could have been jointing you could have been jointing they could have been jointing

Negation

Simple form	V-ing form
I couldn't joint you couldn't joint he couldn't joint we couldn't joint you couldn't joint they couldn't joint	I couldn't be jointing you couldn't be jointing he couldn't be jointing we couldn't be jointing you couldn't be jointing they couldn't be jointing
Perfect	V-ing perfect
I couldn't have jointed you couldn't have jointed he couldn't have jointed we couldn't have jointed you couldn't have jointed they couldn't have jointed	I couldn't have been jointing you couldn't have been jointing he couldn't have been jointing we couldn't have been jointing you couldn't have been jointing they couldn't have been jointing

Interrogative form

Simple form	V-ing form
could I joint? could you joint? could he joint? could we joint? could you joint? could they joint?	could I be jointing? could you be jointing? could he be jointing? could we be jointing? could you be jointing? could they be jointing?
Perfect	V-ing perfect
could I have jointed? could you have jointed? could he have jointed? could we have jointed? could you have jointed? could they have jointed?	could I have been jointing? could you have been jointing? could he have been jointing? could we have been jointing? could you have been jointing? could they have been jointing?

Interro-negative form

Simple form	V-ing form
couldn't I joint? couldn't you joint? couldn't he joint? couldn't we joint? couldn't you joint? couldn't they joint?	couldn't I be jointing? couldn't you be jointing? couldn't he be jointing? couldn't we be jointing? couldn't you be jointing? couldn't they be jointing?
Perfect	V-ing perfect
couldn't I have jointed? couldn't you have jointed? couldn't he have jointed? couldn't we have jointed? couldn't you have jointed? couldn't they have jointed?	couldn't I have been jointing? couldn't you have been jointing? couldn't he have been jointing? couldn't we have been jointing? couldn't you have been jointing? couldn't they have been jointing?