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

那在形容词性定语从句里面。

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

然而，们在这个关系从句中添加了更多信息。

We use them in relative clauses too.

们也在关系从句中使用它们。

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

这们要讲形容词从句，也叫关系从句。

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

当关系代词指定了定语从句中语，比如第二句和第四句，它可以被省略。

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，That只能用于们所谓身份辨识分句中，而这种分句能提供信息来帮助别人理解你正在谈论内容。

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” 一个关系从句。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.

另一个常见结构关系从句，使用关系代词，如“who”、“what”或“what”来连接两个从句。

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

有从句，由从属从句或非从句、关系从句混合而成。

We discussed relative clauses in an earlier Everyday Grammar story.

们在之前每日语法已讨论了关系从句。

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

关系代词用来连接一个关系从句和句子其余部分。

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

这里关系从句都以 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用法稍微有点不正式。在一些关系分句中，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.

这两个单词们今天要讨论内容啦，关系从句中‘which’或‘that’。

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

最后一个关系代词 “what” 也可以用于定语从句中，但它比较特别。

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.关系从句，两个从句。

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

像这些句子限定性定语从句了，限定了们所讨论名词哪个。

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

关系从句，形容词从句，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.

如果你想提高你句子语法水平话，关系从句另一个非常有用话题。

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 等引导关系从句，除非真很有必要。