英语定语从句怎样才能做明白?指物时怎样区分that和which?指人时怎样区分that和who whom?如题

1.whom指人,在从句中作宾语,可省略.e.g.Do you know the man (whom) we saw at the Beijing Hotel?也可以用that ,可以省略.2.which 指物,在句中作主语或宾语,作宾语时可以省略.e.g.I’m not interested in the book which （that）has just been published.3.that指人或物,在从句中做主语或宾语,作宾语时可以省略.The house that （which）I’m going to buy faces south.在限制性定语从句里,如果先行词是物,which和that的用法基本上是一样的,作宾语时,都可以省略,作主语则保留.但是,在非限制性定语从句里,只能用 which 不能用that.只能用that不能用which的情况：先行词前有下列词语修饰时,定语从句必须用 that 引导.all,every,any,little,few,much,no,only,very,the + 序数词,the + 形容词最高级 eg.This is the cleanest park that you can imagine.eg.This is the only book that has been written in French.*在 who 或 which 引导的特殊疑问句中,限制性定语从句必须用 that 引导.eg.Who is the man that is standing over there.* 先行词在从句中作表语时,限制性定语从句通常用 that 引导.(常可省略) eg.She is no longer the girl that she was before she went to the country.