begin(start) doing/to do

　　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。

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.

mean to doing/to do

mean to do　 打算、想

mean doing　意味着

I mean to go, but my father would not allow me to.

我想去，但是我父亲不肯让我去。

To raise wage means increasing purchasing power.

赠加工资意味着增加购买力。