Full list of discourse markers to use in the writing and speaking part of the ielts

in 
fact
” or, “
as a matter of fact
” because the speaker or writer is not correcting or 
contradicting another person but instead, is simply writing a description of the cost of 
houses in Beijing, a description that begins with a negative statement. 
A house with a garden in Beijing is not cheap. On the contrary, a house with a 
garden in Beijing is very expensive.
On the other hand, the following example of usage a) is suitable because Speaker 2 is 
correcting Speaker 1. 
Speaker 1: “I was told that a house with a garden in Beijing was quite cheap.” 
Speaker 2: “
On the contrary
, a house with a garden in Beijing is very expensive.”
Advice about using, "On the contrary" in the Writing test 
In general, I think most IELTS candidates should be careful about using “
On the 
contrary
” in the Writing test. In fact, it would be better to use alternative ways to 
express yourself, such as, “
in fact
” or, “
as a matter of fact
”. “
On the contrary
” is 
mostly used in speaking (usage a) and its use in writing (usage b) can sometimes have 
a tone that is unnecessarily formal or literary. Not only that, when you use the words, 
"On the contrary", you should be contradicting or correcting someone. In the writing 
test, this "someone" would usually be "some people" who believe or state a certain 
opinion, which you feel you can prove to be erroneous. 
5. Concession
(concede (v):
(These examples of concession are often followed by a counter argument 
(
反
论点
) beginning with 'but' or some similar word or phrase.) 
These beginning words can be used to concede that the other speaker is correct. 
Of course; Admittedly; Naturally; Obviously; Clearly; Undeniably; Undoubtedly