"Very simple" in Engpsh can be translated as "so simple".

The origin of "so" as an intensifier to indicate something being simple is informal, and it can be considered informal or colloquial in Engpsh. It is often used in casual conversation and can be seen in text messages, social media posts, and informal emails.

Here are some example sentences in Engpsh with the corresponding Chinese translations:

This problem is so simple, even a child could solve it.
这个问题非常简单，就连孩子都能解决。

The instructions were so clear, I finished the project in no time.
说明非常清楚，我很快就完成了项目。

This recipe is so easy, even someone who has never cooked before could follow it.
这道菜非常简单，即使从没做过菜的人也能按照它做。