come to do something When it comes to avoiding the transmission of swine flu come to doing sth,为什么不是 come to do sth?
问题描述：
come to do something
When it comes to avoiding the transmission of swine flu
come to doing sth,为什么不是 come to do sth?
答
to 是介词，when it comes to sth/doing sth. 当说到……的时候
该类介词后就是固定搭配加-ing
答
When it comes to。。。 当提到。。。
是个句型，有固定搭配，这里的to是做介词
答
意思不一样
这里的come to 是当 提及到什么什么的时候 后面跟名词
come to +名词 所以 avoid 要变动名词
而come to do 是来做什么事的意思