describe的現在分詞形式是什麼

例句：

Describe how you did it.

談談你是怎樣做這事的`。

I cannot describe it, I can't find the words

我描述不上來，我找不到合適的字眼。

We asked her to describe what kind of things she did in her spare time

我們請她描述一下她業餘時間都在做什麼。

The effect is almost impossible to describe

這種影響幾乎無法用言語描述。