同学你好，该知识点来自沪江网校《新概念英语2、3、4册连读【随到随学班】》的课程，想要更系统的学习，欢迎进入课程学习。不仅可以和更多的同学一起学习，而且还有老师、助教随时的学习指导和知识点解答哦。

同学你好~
begin to do和begin doing的意思基本没有太大差别，可以换用。
如果谈论开始一项长期的事情，多用doing，比如
How old were you when you first began playing the piano?

如果谈论开始意识到、想到什么，多用to do
She began to think she was wrong after a second thought.
经过重新考虑后，她开始认为她错了。

当begin用于进行时态时，其后跟to do。如：
Mary is beginning to do her homework.

当主语是物或用于描述天气变化时，其后跟to do。如：
The water began to boil. 水开始开了。

祝同学学习进步~