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 could not joint you could not joint he could not joint we could not joint you could not joint they could not joint	I could not be jointing you could not be jointing he could not be jointing we could not be jointing you could not be jointing they could not be jointing
Perfect	V-ing perfect
I could not have jointed you could not have jointed he could not have jointed we could not have jointed you could not have jointed they could not have jointed	I could not have been jointing you could not have been jointing he could not have been jointing we could not have been jointing you could not have been jointing they could not 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
could I not joint? could you not joint? could he not joint? could we not joint? could you not joint? could they not joint?	could I not be jointing? could you not be jointing? could he not be jointing? could we not be jointing? could you not be jointing? could they not be jointing?
Perfect	V-ing perfect
could I not have jointed? could you not have jointed? could he not have jointed? could we not have jointed? could you not have jointed? could they not have jointed?	could I not have been jointing? could you not have been jointing? could he not have been jointing? could we not have been jointing? could you not have been jointing? could they not have been jointing?