come to do
=来干(从事).某事.
Excuse me,would you like to come to do me a fever?
对不起,请您过来一下,我有一个问题想问一下您.
I've come to do voluntary service.
我是来尽义务的.
We are looking forward to our clients come to do business with us.
我们欢迎新老客户前来洽谈业务.
come to doing
一般,常用的句型是 ‘When it comes to 动词+ing,.’意思是‘当说到.的话题时,.’
Harry never misses a trick when it comes to doing business.
谈到做生意,哈里从不错过时机.
When it comes to gossiping,Mrs Williams never misses a trick.说到在背后议论别人,威廉斯太太可精明着呢.