首先我们来看下so that和so...that的大致意思：
so that：词性为连词，so that是一个固定搭配，由so和that组成。
so...that：词性为连词，so...that也是一个固定搭配，由so和that组成。
通过下面的表格我们了解下so that和so...that的含义、发音和用法
接下来让我们看下so that和so...that的用法区别：
1.语法功能：so that引导目的状语从句或结果状语从句，表示目的或结果；so...that引导结果状语从句，表示程度或结果超出预期。
例子：
- I bought an umbrella so that I wouldn't get wet in the rain.
(我买了一把雨伞，以便下雨时不会淋湿。)
- He is so smart that he surpasses his teacher.
(他太聪明了，以至于超越了他的老师。)
2.位置：so that通常位于句末；so...that通常位于主句之后和结果状语从句之前。
例子：
- She studies hard so that she can get into her dream university.
(她学习很努力，以便能考上理想的大学。)
- The problem is so complicated that I can't solve it.
(这个问题如此复杂，以至于我无法解决。)
3.逻辑关系：so that表示目的或原因与结果之间的逻辑关系；so...that表示程度或原因与结果之间的逻辑关系。
例子：
- She opened the window so that fresh air could come in.
(她打开窗户，以便让新鲜空气进来。)
- The story is so funny that I couldn't help laughing.
(这个故事太有趣以至于我忍不住笑了起来。)
4.可替换性：so that可以被in order that替换；so...that不可替换。
例子：
- Please send me an email so that I can reply promptly.
(请发邮件给我，以便我能及时回复。)
- They arrived so late that they missed the beginning of the movie.
(他们太迟到了，以至于错过了电影的开始。)
5.用于否定句：so that可以用于否定句；so...that不可用于否定句。
例子：
- Please don't speak loudly so that you won't disturb others.
(请不要大声说话，以免吵到其他人。)
- The bomb is so dangerous that it cannot be handled.
(这个炸弹太危险以至于无法处理。)
6.句型变化：so that后面接主语+谓语动词，常用于陈述句；so...that后面接主语+谓语动词的倒装形式，常用于感叹句。
例子：
- They work hard so that they can get promoted.
(他们工作得很努力，以便能获得升职。)
- So beautiful is the sculpture that it astonishes people.
(这个雕塑如此精美，以至于让人惊叹。)