One day the topic turned to saying:'I Love You'

问题描述:

One day the topic turned to saying:'I Love You'
为什么是turned to doing?顺便请各位帮我翻译一下,

一天话题转为说我爱你
sth turns to sth 从什么转向什么
to 是介词,故后面加名词或动名词