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You can use the following words and expressions:
To talk about advantages and disadvantages
A further / major advantage…
Another positive / negative aspect of…
The greatest advantage/disadvantage…
The most serious disadvantage…
The strong point of…
The weak point of …
To show contrast
But…
Despite…
In spite of..
Even though…
However..
Nevertheless…
Notwithstanding…
On the one hand /on the other hand…
Still…
Whereas…
While…
Whilst…
However,…
Yet…
To criticize a point made
As this argument is not
very convincing…
As, in my opinion, this
point has not been made
clear enough…
I cannot believe that…
I find too many week
points…
Nobody could even
consider…
Serious doubts can be
raised against this…
Other useful sentences to express your opinion:
I firmly believe…
In my view
I’m convinced…
It’s a matter of opinion…
I share your opinion on the matter…
To show the results of scientific evidence:
Someone has published his/her research on …
His/her theory provides evidence to support…
Someone’s paper clearly shows/ proves that…
