begin(start) doing/to dobegin / start to do sthbegin / 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) begin, start用进行时时，后面动词用不定式to doI was beginning 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 begin to understand the truth。我开始明白真相。4) 物作主语时It began to melt
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