English verb conjugation
COULD ESTABLISH

Regular verb: establish - established - established

Affirmation

Simple form	V-ing form
I could establish you could establish he could establish we could establish you could establish they could establish	I could be establishing you could be establishing he could be establishing we could be establishing you could be establishing they could be establishing
Perfect	V-ing perfect
I could have established you could have established he could have established we could have established you could have established they could have established	I could have been establishing you could have been establishing he could have been establishing we could have been establishing you could have been establishing they could have been establishing

Negation

Simple form	V-ing form
I could not establish you could not establish he could not establish we could not establish you could not establish they could not establish	I could not be establishing you could not be establishing he could not be establishing we could not be establishing you could not be establishing they could not be establishing
Perfect	V-ing perfect
I could not have established you could not have established he could not have established we could not have established you could not have established they could not have established	I could not have been establishing you could not have been establishing he could not have been establishing we could not have been establishing you could not have been establishing they could not have been establishing

Interrogative form

Simple form	V-ing form
could I establish? could you establish? could he establish? could we establish? could you establish? could they establish?	could I be establishing? could you be establishing? could he be establishing? could we be establishing? could you be establishing? could they be establishing?
Perfect	V-ing perfect
could I have established? could you have established? could he have established? could we have established? could you have established? could they have established?	could I have been establishing? could you have been establishing? could he have been establishing? could we have been establishing? could you have been establishing? could they have been establishing?

Interro-negative form

Simple form	V-ing form
could I not establish? could you not establish? could he not establish? could we not establish? could you not establish? could they not establish?	could I not be establishing? could you not be establishing? could he not be establishing? could we not be establishing? could you not be establishing? could they not be establishing?
Perfect	V-ing perfect
could I not have established? could you not have established? could he not have established? could we not have established? could you not have established? could they not have established?	could I not have been establishing? could you not have been establishing? could he not have been establishing? could we not have been establishing? could you not have been establishing? could they not have been establishing?