describe的現在分詞形式是什么

　　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余時間都在做什么。

　　The effect is almost impossible to describe

　　這種影響幾乎無法用言語描述。