We use them in relative clauses too.

我们也在系句中使用它们。

We discussed relative clauses in an earlier Everyday Grammar story.

我们在之前的每日语法论了系句。

Relative clause, adjective clause, what are we talking about? That sounds confusing!

系句，形容词句，我们在说什么呢？完全听不懂啊！

The relative clauses here all begin with 'who' or 'whose'.

里的系句都以 who 或 whose 开头。

This is where we come to adjective clauses, also called relative clauses.

就是我们要讲的形容词句，也叫系句。

This one, however, we're adding more information in this relative clause here.

然而，我们在系句中添加了更多的信息。

Learning about relative clauses can help you to connect your ideas in complex sentences.

学习系句可以帮助你在复杂的句子中将不同想法进行连接。

Let's see how those relative clauses work.

让我们看看在些系句中是如何使用 whom 的。

We use relative clauses to give more information about something we've just mentioned.

我们使用系句来提供于我们刚刚提到的事情的更多信息。

Relative clauses are another useful topic if you want to improve your sentence grammar.

如果你想提高你的句子语法水平的话，系句是另一非常有用的话题。

We've just seen that sometimes relative clauses have prepositions in them.

我们刚刚看到，有时候定语句中会有介词。

And that's when they're used in relative clauses to introduce adjective clauses.

那就是在形容词性的定语句里面。

We use relative clauses to add information about someone we've just mentioned.

我们使用系句来添加我们刚刚提到的人物的信息。

A relative pronoun is used to connect a relative clause to the rest of a sentence.

系代词用来连接一系句和句子的其余部分。

The preposition can be in two positions immediately before the relative clause or at the end of the relative clause.

介词有两位置，就放在定语句前，或放在定语句句末。

There is the clauses, so a mixture of subordinate dependent or non dependent clauses, relative clauses.

有句，由属句或非句、系句混合而成。

So for example, I'm living in London which is a beautiful city. Relative clause, two clauses.

I'm living in London which is a beautiful city.系句，两句。

Thirdly, don't use relative clauses, with who, which, that, where, etc. , unless it's really necessary.

第三，不要用 who、which、where 等引导系句，除非真的很有必要。

Defining relative clauses such as these specify which noun we are talking about.

像些句子就是限定性定语句了，限定了我们所论的名词是哪。

Now, in a relative clause, we can use 'who' or 'whom' for people, and 'which' for things.

现在来说一下吧，在一系分句里，是人时，用Who，指物时，用Which。