信号词用于指示句子、段落或文本中的逻辑关系，帮助读者或听者理解信息的组织结构。以下是一些常见的信号词类别及其例子：

建议类:

Let's

If

Just

Maybe

Could

Should

It wouldn't hurt

Why not

转折类:

But

However

Nevertheless

While

Yet

Unless

Except for

并列类:

First

Finally

Before

Until

First of all

Between

On the right/left

Firstly

Next

Subsequently

To begin with

因果关系类:

Because

Because of

Due to

Since

As

For

The reason is

That's why

By reason of

Owing to

So

So that

Therefore

-thereby

Hereby

Thus

As a result

Consequently

Hence

Accordingly

数字信息类（尤其在雅思听力中）:

数字信息，如邮编、电话号码、地址等

对比转折关系类:

But

However

Actually

Whereas

On the other hand

On the contrary

In fact

顺接和递进:

Also

Furthermore

Moreover

What is more

In addition

表目的:

Lest

For fear that

In case that

表比较关系:

By contrast

In contrast to

Analogy

Liken

Likewise

Equally

Equivalent

Parallel

As well

这些信号词帮助指示文本中的逻辑关系，是理解文章或听力材料结构的关键。掌握这些信号词有助于提高阅读理解或听力理解能力