I prefer playing computer games to swimming 这里的to swimming 而不是to swim 是不是因为to是做介词用,而不是不定式.跟的是prefer doing sth.又为什么不用than.

I prefer playing computer games to swimming 这里的to swimming 而不是to swim 是不是因为to是做介词用,而不是不定式.跟的是prefer doing sth.
又为什么不用than.

固定词组prefer doing to doing ,句中computer games 相当于doing

prefer sth/doing sth to sth/doing sth是一个固定的搭配。当然也可用另一搭配 prefer to do sth than do sth 相当于would rather do than do