你說的情況在定語從句中常出現(xiàn).situation ,case ,point作先行詞時,關(guān)系詞一般情況下用where.如：I have reached a point in my life_where_I am supposed to make decisions of my own.It's helpful to put children...at which=where?where=介詞+which；其中介詞可根據(jù)句意表達和搭配，用合適的介詞。如：Thisisthe point【某地方；地點】_at_which=where_the river divides。This is the farm _on which_they usuallywork.