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如：He made a long speech, as was expected.
He made a long speech, which was unexpected.
Tom drinks a lot every day, which his wife doesn’t like at all.
(3)但是，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，
注：⑤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：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。
注：⑥一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：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。
名词性从句
在主从复合句中，从句可以充当主句的主语、表语、宾语或同位语。由于在多数情况下，主语、表语、宾语或同位语这四种句子成分由名词性词类充当，所以，我们把这些作用相当于名词的从句统称为名词性从句，把充当主语、表语、宾语或同位语的从句分别称为主语从句、表语从句、宾语从句或同位语从句。也就是说充当什么成分就叫什么从句。名词性从句由连接词(或关联词)引导。
常用的连接词有：
|
连接词 |
作用 |
|
whether是否 that（本身无词义） |
只起连接词作用，引导从句，在从句中不作任何成分 在从句中分别作主语、宾语和定语 |
|
who，whom，whose which哪一个 what什么，所…的 |
在从句中分别作主语、宾语和定语 在从句中分别作主语、宾语和定语 除了起连接词作用外，还在从句中作状语 |
|
when什么时候，where什么地方 how怎样，怎么，why为什么 |
|
它们的特点是：1、疑问词有本身的词义;2、疑问词在从句中担当句子成分，如主语、宾语或状语;3、这种疑问词引导的从句一律用陈述语序，不能用疑问语序。
