English verb conjugation
COULD ADJOIN

Regular verb: adjoin - adjoined - adjoined

Affirmation

Simple form	V-ing form
I could adjoin you could adjoin she could adjoin we could adjoin you could adjoin they could adjoin	I could be adjoining you could be adjoining she could be adjoining we could be adjoining you could be adjoining they could be adjoining
Perfect	V-ing perfect
I could have adjoined you could have adjoined she could have adjoined we could have adjoined you could have adjoined they could have adjoined	I could have been adjoining you could have been adjoining she could have been adjoining we could have been adjoining you could have been adjoining they could have been adjoining

Negation

Simple form	V-ing form
I could not adjoin you could not adjoin she could not adjoin we could not adjoin you could not adjoin they could not adjoin	I could not be adjoining you could not be adjoining she could not be adjoining we could not be adjoining you could not be adjoining they could not be adjoining
Perfect	V-ing perfect
I could not have adjoined you could not have adjoined she could not have adjoined we could not have adjoined you could not have adjoined they could not have adjoined	I could not have been adjoining you could not have been adjoining she could not have been adjoining we could not have been adjoining you could not have been adjoining they could not have been adjoining

Interrogative form

Simple form	V-ing form
could I adjoin? could you adjoin? could she adjoin? could we adjoin? could you adjoin? could they adjoin?	could I be adjoining? could you be adjoining? could she be adjoining? could we be adjoining? could you be adjoining? could they be adjoining?
Perfect	V-ing perfect
could I have adjoined? could you have adjoined? could she have adjoined? could we have adjoined? could you have adjoined? could they have adjoined?	could I have been adjoining? could you have been adjoining? could she have been adjoining? could we have been adjoining? could you have been adjoining? could they have been adjoining?

Interro-negative form

Simple form	V-ing form
could I not adjoin? could you not adjoin? could she not adjoin? could we not adjoin? could you not adjoin? could they not adjoin?	could I not be adjoining? could you not be adjoining? could she not be adjoining? could we not be adjoining? could you not be adjoining? could they not be adjoining?
Perfect	V-ing perfect
could I not have adjoined? could you not have adjoined? could she not have adjoined? could we not have adjoined? could you not have adjoined? could they not have adjoined?	could I not have been adjoining? could you not have been adjoining? could she not have been adjoining? could we not have been adjoining? could you not have been adjoining? could they not have been adjoining?