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In this argument the author reaches the conclusion that.... The basis for this recommendation is that.... An additional reason given in support of this recommendation is that...(The author cites...as an example in support of this recommendation). At first glance, the author's argument appears to be somewhat convincing, but further reflection reveals that it omits some important concerns that should be addressed to substantiate the argument.
In the first place,
In the second place,
In the third place,
In conclusion, the author fails to provide adequate justification for.... As it stands, the reasoning does not constitute a logical argument in favor of the recommendation. To strengthen the argument, the author would have to provide evidence to prove that.... To better assess the argument, we need additional detailed information about...so that we can establish the conclusion whether....
Issue
The issue of whether...is a complex and controversial one. Different people hold different views due to their respective angles. On the one hand, as is well-known and has often been advocated, ...; on the other hand, others probably insist that.... We do not have to look very far to see the valid standpoint of this matter. In the following analysis, I would like to reason and provide evidence favoring the former one and refuting the latter one. (The complex nature of the above issue requires us to consider it on a case-by-case basis. In my point of view, whether one has advantages over the other depends on the specific circumstances.)
In the first place, the important reason that can be presented to develop my position is that.... A good example may be found in the case that.... Under this circumstance/therefore, it is obvious that....
In addition, there is another reason for me to choose the former statement/consider the latter statement to be wrong. The reason is not far to seek:.... To illustrate, a case in point in this respect is that....
Admittedly, there is no denying that...in some conditions. As we know, .... However, this alone does not constitute a sufficient support to.... (When...of X and Y are carefully compared, the most striking conclusion is obvious. To sum up, while...may be true in exceptional cases, I agree that....)
Consequently, I advocate that..., because: (1) ...; (2) .... Due to the above-mentioned reasons, which sometimes intertwine to form an organic whole and thus become more persuasive, we may safely arrive at the conclusion I support. | 
