You also cannot by the entire company by their shares. E.g. if I had a GOOG share and I don't sell it, you can jump around as much as you want and you won't get it.
Sure you can, it happens all the time in buyouts and mergers.
Dell stockholders will receive ... $13.88 per share in cash.
Whether you (as a minor shareholder) agreed with the buyout or not, your share got sold for cash.
Yep. Hapenned to me when Telefonica/Movistar adquired its filial Terra. Didn't want to sell, yet my shares got converted to a ridiculous small number of Telefonica shares.