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1、begin / start to do sth begin / 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 do I was beginning to get angry。
2、 我开始生起气来。
3、 3) 在attempt, intend, begin, start 后接know, understand, realize这类动词时,常用不定式to do。
4、 I begin to understand the truth。
5、 我开始明白真相。
6、 4) 物作主语时 It began to melt.。
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