start to do sth start doing sth. 1) 谈及一项长期活动或开始一种习惯时，使用doing. How old were you when you first started playing the piano? 你几岁时开始弹钢琴？ 2) start用进行时时，后面动词用不定式to do I was starting to get angry。 我开始生起气来。 3) 在attempt, intend, begin, start 后接know, understand, realize这类动词时，常用不定式to do。 I start to understand the truth。 ...
