原句: Because the weather was so fine, they all enjoyed themselves. 1. The weather so fine, they all enjoyed themselves. 2. The weather being so fine, they all enjoyed themselves.
没有见过第一句的用法。 第二句语法上是对的,但也有一些别扭,说成With a fine weather, they all enjoyed themselves更好。 另外例句也不太地道,通常说Because of the fine weather,...不会用because,因为它是用来解释why的连接词。