(1)一个先行词后面可以跟一个以上的定语从句，这种现象叫双重关系从句。
例如：
Here are some words which are often used but which are very confusing. 这里有些常用但非常混乱的词。
He is the only person that I can find who is able to solve the problem. 他是我能找到的唯一解决这个问题的人。
(2)如果从句和主句的动作在将来不同的时间发生，则两部分都要用来将来时。
在“介词+关系代词”的结构中，也可用复杂介词，如：by means of (用，依靠)，as a result of (作为结果)等。
例如：
I have three children, one daughter and two sons, all of whom graduated from the same university. 我有三个孩子：一个女儿、两个儿子，他们都毕业于同一所大学。
The police, in whom I have great confidence, are trying to find out who did it. 我对警察有极大的信心，他们正在努力寻找是谁做的这件事。
This is the part of the river in which I like to swim. (in which=where) 我喜欢在这条河里面游泳，这就是(我喜欢游的)那个地方。
The man from whom you bought the house is my uncle. 你从他那里买下房子的那个人是我叔叔。
This is the desk by means of which he jumped over the wall. 这就是他用来跳过墙去的那张桌子。
She was running a fever, as a result of which she failed in the exam. 她当时正发烧，所以考试失败了。
He is the man from whose house the picture was stolen. 他就是那个家里的画被偷了的人。
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