inwhich用于定语从句,作关系副词,在句中不做成分,inwhich=where
inwhich只能用在定语从句中,等于where,在定语从句中作状语.
如:HelivedinthehouseinwhichTomoncelived.
HelivedinthehousewhereTomoncelived.
定语从句中.如
thisistheroominwhichwestayed
先行词是room,后的句子是用来修饰room的
但是room不可做stay的成分,因为stay是不及物动词,后不可直接家宾语
所以要有个介词.
其实上述的句子=
thisistheroomwhichwestayedin.
这里的介词是可以提到which前的
注意,第二个句子可用that或省略