As you doing preparation of IELTS exam and asking for IELTS Writing -Key Words & Expressions, so on your demand I am telling list of its keywords:

Stating Your Opinion

In my opinion,


According to me,

In my view,


To me,

From my point of view,


I think

It seems to me that


I believe

From my perspective


To my way of thinking

It appears that


I suppose

I realize


I understand

I imagine


I feel



Giving Examples

For example,


For instance,

such as


In other words,

as


like

that is


namely

To illustrate


To paraphrase



Comparing

Similar to


As...as

in common


also

Either...or


In the same way,

Neither...nor


At the same time

Just as


resemble



Contrasting

However,


But

On the contrary,


On the other hand,

Differ from


Nevertheless

Although


Though

Otherwise


Instead

Alternatively,


Even though


Generalizing

Generally,


Generally speaking,

Overall,


On the whole,

In general,


By and large,

It seems to me that


I believe

All in all,


Basically,

Essentially,


As a rule,

All things considered


For the most part



Expressing Certainty

Certainly,


Undoubtedly,

Doubtless,


No doubt,

Definitely,


Of course,



Expressing Partial Agreement

More or less,


To some extent,

Up to a point,


Almost,

In a way,


So to speak,



Showing cause

Due to


Because

Because of


Owing to



Showing effect

Therefore,


As a result,

Consequently,


For this reason,

Thus,


So,

thereby


Eventually,

Hence,


The reason why



Marking time

First,


Last

Second,


Lastly,

Third,


Then,

Firstly,


First of all,

Secondly,


Before

Thirdly,


After

During


While

To begin with


At the same time

Simultaneously


After this / that

Since


Meanwhile

Afterwards


Following this

When


As soon as



Adding Information

Furthermore


In addition

Also


And

Moreover


Similarly

Likewise


As well as

Besides


Too

Even


What’s more



Expressing condition

If


Whether

In case


Unless

Provided that


So that



Concluding

To summarize


In conclusion

Lastly,


Finally,

To conclude with,


In short,