The general format for writing academic writing task 1 is as follows

Formal and Informal expressions and words: 
Few more informal expressions with their formal versions are given below. 
Since IELTS is a formal test, your writing should be formal as well. Using 
informal words or expressions should be avoided. Some of the informal words 
are so frequently used that it would be tough for you to eliminate them from 
your writing. However, we would suggest you make a habit of using formal 
words and expressions instead- for your performance and band score's sake. 

---

23 
Informal
Formal
Go up 
Increase 
Go down 
Decrease 
Look at 
Examine 
Find about 
Discover 
Point out 
Indicate 
Need to 
Required 
Get 
Obtain 
Think about 
Consider 
Seem 
Appear 
Show 
demonstrate/ 
illustrate 
Start 
Commence 
Keep 
Retain 
But 
However 
So 
Therefore/ 
Thus 
Also 
In addition/ 
Additionally 
In the meantime 
In the interim 
In the end 
Finally 
Anyway 
Notwithstanding 
Lots of/ a lot of 
Much, many 

---

24 
Kids 
Children 
Cheap 
Inexpensive 
Right 
Correct 
I think 
In my opinion 
Following are the vocabularies for Academic IELTS Writing Task 1 grouped as 
Noun, Verb, Adjective, Adverb, and Phrase to help you improve your 
vocabulary and understanding of the usages of these while describing a 
graph. 
Noun:
Increase:
A growth: There was a growth in the earning of the people of the city at the 
end of the year. 
An increase: Between the noon and evening, there was an increase in the 
temperature of the coast area and this was probably because of the 
availability of the sunlight at that time.