computer would never {be used} by most people in the future

{be used},是被动语态,整句就是：在未来,电脑永远不会{被（大多数人）使用}.
I think in the future most people will use smartphones, net books, ?pads instead of the traditional computers.
再问： my father can flying a plane 为什么fly要加ing
再答： 其实，说实话，真的不用加ing的，can是情态动词，后面跟原型，所以是 my father can fly a plane,或者是搞笑的： my father can fly in a plane... ...如果有错的话，请原谅我，俺英语一般只是用语感的。