The phrasal verb 'tear up' is separable because you can say 'She tore the letter up' or 'She tore up the letter'.

* tear up 是可以分开的短语动词，因为既可以说 She tore the letter up ，又可以说 She tore up the letter。

《牛津词典》

The phrasal verb perk up describes when someone becomes happier and in a better mood after feeling not so good.

短语里的动词这里描述的是某个人在精神不振后变得更愉悦，振奋。

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If an English noun which means a tool is used as an English verb in the phrasal verb, it may be considered as an adverbial of man...

如果表示工具的英语名词在短语动词中作动词用，则可把它看作行为方式状语或做某事借助的工具。

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