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。

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

然而，我们在这个句中添加了更多的。

We use them in relative clauses too.

我们也在句中使用它们。

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

这就是我们要讲的形容词句，也叫句。

When the relative pronoun represents the object of the relative clause, such as in sentences b) and d) , it can be left out.

当代词指定了定语句中的宾语，比如第二句和第四句，它就可以被省略。

But, 'that' can only be used in what we call identifying relative clauses and those are clauses where you need the information to understand what you're talking about.

但是，That只能用于我们所谓的身份辨识分句中，而这种分句能提来帮助别人理解你正在谈论的内容。

The " he can't refuse" part of the sentence is a relative clause. It is modifying, or changing the meaning, of the noun " an offer."

句中 “he can't refuse” 是一个句。它对名词 “an offer” 进行修饰或改变其含义。

Another common structure is relative clauses, using relative pronouns like who, which or what to link two clauses.

另一个常见的结构是句，使用代词，如“who”、“what”或“what”来连接两个句。

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

有句，由属句或非句、句混合而成。

We discussed relative clauses in an earlier Everyday Grammar story.

我们在之前的每日语法已讨论了句。

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

代词用来连接一个句和句子的其余部分。

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

这里的句都以 who 或 whose 开头。

Now, 'that' is less formal, and it can be used for both people and things in some relative clauses.

That的用法稍微有点不正式。在一些分句中，它可以同时用来修饰人和物。

Now these words are exactly what we're going to talk about today, 'which' or 'that' in relative clauses.

这两个单词就是我们今天要讨论的内容啦，句中的‘which’或‘that’。

The last relative pronoun " what" can also be used in relative clauses, but it is different.

最后一个代词 “what” 也可以用于定语句中，但是它比较特别。

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.句，两个句。

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

像这些句子就是限定性定语句了，限定了我们所讨论的名词是哪个。

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

句，形容词句，我们在说什么呢？完全听不懂啊！

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，句是另一个非常有用的话题。

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 等引导句，除非真的很有必要。