There's no need to be embarrassed. 没有必要感到惶恐。

　　There's really no need to explain. 真没有必要作解释。

　　No need to talk about it. 没必要谈论这个话题。

　　You need to clean up this place! 你该打扫这个地方了！

　　I will. There's no need to get angry.  我会的，不过你也没必要生气吧。