高一英语定语从句的一个问题给个定语从句,填关系词,

高一英语定语从句的一个问题给个定语从句,填关系词,怎么判断直接用关系代词,或填介词加WHICH,WHO有的比如说，Kun

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看关系代词作从句中的什么成分.如果做主语,则不加介词；如果做动词后的宾语,也不加介词；如果做介词后的宾语,那就看这个介词是否存在了,若存在则不加,反之则加.
例如：The girl whom he was looking for is my sister .中已有介词for,whom 前就不加介词了.
They tried to think of a method by which they could save time and money .中的by 就得加上.