高中英语定语从句啥时候只能用whose

在表示“所属”关系时,如：
The boys are playing football in the sportsground.The boys' school bags are here.
--------The boys,whose schoolbags are here,are playing football in the sports ground.
whose schoolbags == the boys' schoolbags

关系代词所引导的词与先行词是所属关系的时候用whose
例句1.The man ,whose hair is so long, is an known artist.( 这里的hair就属于这个主语the man ,是主语的一部分)
2.The award belongs to Tom, whose contribution to the project is ...

作定语时