E eeky 先輩 8 Jun 2010 2,431 22 48 15 Jan 2015 #1 Hi, 「いったい何しにきたのかな?」 しにきた = し (stem of する) + に (expressing purpose) + きた (来た), right?
Toritoribe 松葉解禁 Moderator 22 Feb 2008 18,145 4,612 328 15 Jan 2015 #2 Right. This would be needless to say, your ability to parse a sentence is no doubt increasing.