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

题目

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.

答案

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