start to do和start doing区别
start to do sth VS. start doing sth. 开始做某事
I was five when I first started playing the piano.
He sat down at the piano and started to play.
The car started to move. 汽车开始移动。
1）be starting to do sth.
She is starting to get angry. 她开始生气了。
2）start to understand/realize…
He started to realize how important this was.