语法总结
so ... that ... 结果状语从句
The ball struck him so hard that he nearly fell... 表示球击打得如此重，以至于他差点落水。
相似句：
- He ran so fast that nobody caught him.
- It was so cold that the river froze.
过去进行时与一般过去时
were playing / were rowing 描写背景，kicked、struck、called 推进突然发生的动作。
相似句：
- They were talking when the phone rang.
- I was walking home when it started to rain.