下面这句英文中him和后面从句的关系是什么啊,这是什么语法现象,sometimesidoubtwhetherleifengwasthatnice,asalliknowabouthimwastoldbyothers这句英文中him和后面从句的关系是什么啊,这是什么语

Question

下面这句英文中him和后面从句的关系是什么啊,这是什么语法现象,
sometimes i doubt whether lei feng was that nice ,as all i know about him was told by others 这句英文中him和后面从句的关系是什么啊,这是什么语法现象,

Answer 1

as all i know about him （who/whom/that) was told by others.
这是由who/whom/that引导的定语从句
在定语从句中,引导词that/who/whom在从句中作宾语时可省略.