Beginning:

　　1.The arguer may be right about ..., but he seems to neglect(fail) to mention (take into account )the face that ...

　　2.
As opposed to widely held belief that ...,I believe that ...
Contrary to generally(commonly) accepted ideas(views) ,I argue that...

　　3.Although many people believe that ..., I doubt whether the argument can bear much (further) analysis (close examnation).

　　4.The advantages of B outweight any benefit we gained from A.

　　5.Although it is commonly(widely/generally) accepted (held/agreed) that ...,It is unlikely to be true that ...

　　6.(Indeed)There is an element (some elements) of truth in this argument(statement), but it ignores a deeper and more basic (important/essential)fact that ...

　　7. It is ture that(Ture,To be sure,Admittedly,) ..., but it is unlikely(it won't be the case/it does not mean ) that ...

　　8.The main (obvious/great) problem (flaw/drawback) with (in ) this argument(view) is that ....

　　it is ignorant of the basic fact that ...

　　9.It would be possible(natural/resonable) to think(believe/take the view) that ... , but it would be absurd(wrong) to claim(argure) that ...

　　10.In all the discussion and debate over ..., one important fact is generally overlooked(neglected).

　　11.Too much emphasis placed on (attention paid to)... may obsecure(overlook/neglect) other facts...

　　12.However sound (logical/valid) this argument may be, it only skims the surface of the problem.

　　13.Although I appreciate that ...,I can not agree with the title statement.

　　14.As far as I am concerned, however, I believe that...

　　15.Among the most convincing reasons given(cited/offered/itendified) by people for...,one should be stressed(emphasized/metioned)...