全国大众英语测验语法——begin(start)doing/todo
begin / start to do sth
begin / start doing sth.
1)谈及一项耐久活动或开始一种习尚时，利用doing.
How old were you when you first started playing the piano?
你几岁时开始弹钢琴？
2)begin, start用举行时时，背面动词用不定式to do
I 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。
我开始年夜白IT。
4)物作主语时
It began to melt.