call up all his friends 中,call up不是动副词组么?为什么代词还要放在up后?

(一)动词+副词:
动词与副词紧密相连,词义上相当于一个简单动词,而且常常有新的词汇意义.如:bring up=educate 教育,培养;find out =discover 发现,理解;turn up=appear 出现;make out =un-derstand.
(二)动词+介词:
部分介词at,for,from,into,of,to,with接在动词后构成动介型短语动词,这类短语动词相当于及物动词,其后可以接宾语,宾语只能位于介词之后.在被动语态中整个短语动词不能分割.如:①The police were ordered to look into the truck accident immediately(look into调查).

是固定的，要依情况而定

代词放中间 名词 可中可后

固定搭配