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1、1）begin后跟to do或doing，含义上没有多少差异。

2、如果谈论一个长期的习惯动作开始养成时，更加常用begin doing。

3、例如：How old were you when you first began playing the piano?2）当begin后面跟的是understand，realize，see，know，think等动词时，用begin to do。

4、例如：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。

5、3）当begin用于进行时态时，其后跟to do。

6、如：Mary is beginning to do her homework.4）当主语是物或用于描述天气变化时，其后跟to do。

7、如：The water began to boil. 水开始开了。

8、It began to get dark before we knew it. 不知不觉地天黑下来了。

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