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 couldn't adjoin you couldn't adjoin she couldn't adjoin we couldn't adjoin you couldn't adjoin they couldn't adjoin	I couldn't be adjoining you couldn't be adjoining she couldn't be adjoining we couldn't be adjoining you couldn't be adjoining they couldn't be adjoining
Perfect	V-ing perfect
I couldn't have adjoined you couldn't have adjoined she couldn't have adjoined we couldn't have adjoined you couldn't have adjoined they couldn't have adjoined	I couldn't have been adjoining you couldn't have been adjoining she couldn't have been adjoining we couldn't have been adjoining you couldn't have been adjoining they couldn't 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
couldn't I adjoin? couldn't you adjoin? couldn't she adjoin? couldn't we adjoin? couldn't you adjoin? couldn't they adjoin?	couldn't I be adjoining? couldn't you be adjoining? couldn't she be adjoining? couldn't we be adjoining? couldn't you be adjoining? couldn't they be adjoining?
Perfect	V-ing perfect
couldn't I have adjoined? couldn't you have adjoined? couldn't she have adjoined? couldn't we have adjoined? couldn't you have adjoined? couldn't they have adjoined?	couldn't I have been adjoining? couldn't you have been adjoining? couldn't she have been adjoining? couldn't we have been adjoining? couldn't you have been adjoining? couldn't they have been adjoining?