什么修饰宾补

eye contact 主语
should be done 情态动词复合结构做谓语
according to the relationship between two people and the place where you stay . 介宾短语做状语 主干是 according to the relationship and the place.
according to 是一个短语介词，整个短语做为一个介词
the relationship and the place 做介词的宾语
between two people 另一个介宾短词做 relationship的定语
where you stay 定语从句做 place的定语

注意：这个句子主句里没有宾语,英语里最重要的句子成分是谓语，只要谓语存在就可以成句。

eye contact /should be done/ accroding to the relationship /between two people /and the place /where you stay .
你要如何划分，肯定是根据意群划分
你举个宾补的例子来

eye contact/(主） should be done/（谓） accroding to the relationship/（宾） between two people and the place/ where you stay .（between开始就是定语从句也是relationship的（宾补），where是修饰place的（定语））