Sentence examples for does could not from inspiring English sources

Asked whether what Luers does could not be done just as well by (for example) a vice-director for administration, who would report to the director, one staff member suggested that Mayor Rudolph Giuliani and other government officials would insist on dealing with the top man, and that de Montebello might not be comfortable in such situations.

But what does "couldn't" mean here?

Maybe what I was trying to do could not be done.

Because what had been done couldn't be taken back.

Nothing the dancers ever do couldn't be part of that game.

What the theatre could do that could not be done elsewhere was not always clear.

I saw what it could do and couldn't do".

Georgia (11-2) did not, could not, slow the onslaught.

For weeks I did not, could not name it.

Menezes did not, could not, hide his own frustrations.

We did not, could not, wish each other well.