English verb conjugation
COULD INTERJOIN

Regular verb: interjoin - interjoined - interjoined

Affirmation

Simple form	V-ing form
I could interjoin you could interjoin he could interjoin we could interjoin you could interjoin they could interjoin	I could be interjoining you could be interjoining he could be interjoining we could be interjoining you could be interjoining they could be interjoining
Perfect	V-ing perfect
I could have interjoined you could have interjoined he could have interjoined we could have interjoined you could have interjoined they could have interjoined	I could have been interjoining you could have been interjoining he could have been interjoining we could have been interjoining you could have been interjoining they could have been interjoining

Negation

Simple form	V-ing form
I couldn't interjoin you couldn't interjoin he couldn't interjoin we couldn't interjoin you couldn't interjoin they couldn't interjoin	I couldn't be interjoining you couldn't be interjoining he couldn't be interjoining we couldn't be interjoining you couldn't be interjoining they couldn't be interjoining
Perfect	V-ing perfect
I couldn't have interjoined you couldn't have interjoined he couldn't have interjoined we couldn't have interjoined you couldn't have interjoined they couldn't have interjoined	I couldn't have been interjoining you couldn't have been interjoining he couldn't have been interjoining we couldn't have been interjoining you couldn't have been interjoining they couldn't have been interjoining

Interrogative form

Simple form	V-ing form
could I interjoin? could you interjoin? could he interjoin? could we interjoin? could you interjoin? could they interjoin?	could I be interjoining? could you be interjoining? could he be interjoining? could we be interjoining? could you be interjoining? could they be interjoining?
Perfect	V-ing perfect
could I have interjoined? could you have interjoined? could he have interjoined? could we have interjoined? could you have interjoined? could they have interjoined?	could I have been interjoining? could you have been interjoining? could he have been interjoining? could we have been interjoining? could you have been interjoining? could they have been interjoining?

Interro-negative form

Simple form	V-ing form
couldn't I interjoin? couldn't you interjoin? couldn't he interjoin? couldn't we interjoin? couldn't you interjoin? couldn't they interjoin?	couldn't I be interjoining? couldn't you be interjoining? couldn't he be interjoining? couldn't we be interjoining? couldn't you be interjoining? couldn't they be interjoining?
Perfect	V-ing perfect
couldn't I have interjoined? couldn't you have interjoined? couldn't he have interjoined? couldn't we have interjoined? couldn't you have interjoined? couldn't they have interjoined?	couldn't I have been interjoining? couldn't you have been interjoining? couldn't he have been interjoining? couldn't we have been interjoining? couldn't you have been interjoining? couldn't they have been interjoining?