表达不确定的用词：May, seem, be likely to, possible, probably, perhaps, be said that, be said to...
in my mind , the following factors/reasons/causes need to be taken into consideration.我认为，我们需要考虑下列因素/原因：
There are several reasons for this phenomenon/why...-(as follows).造成这种现象的原因如下：
And I would like to present two explanations for this: 对于此，我有如下两点愚见：
The reasons are chiefly as follows. 主要原因如下：
There are numerous reasons why ____, and I would like to explore a few of the most important ones here.为什么___________，原因很多，在此列举几个较为重要的原因。
The reasons are presented below. 原因如下。
There are three premier(主要的)/best/ most important, largest, significant, obvious, crucial causes as follows.以下这些是造成这一问题的最主要/最好/最重要/最大/最有意义/明显/至关重要的原因。
This is based on the propensity(倾向，原因) of following points.这基于以下的原因。
The main reason is that.. 主要原因是_____________。
One very important argument for ..... is that...._______的非常重要的原因便是____________________。
The reasons are quite clear. Above all, .... 原因非常清楚。首先(首要的是)__________。
The first reason can be seen by every person. 第一个原因其实很明显。
The first and most important reason is that.....第一个而且最重要的原因是______________。
One of the reasons that are given for....is that.... ______________的原因之一是__________________。
Perhaps this is because of the simple fact that.....也许，原因很简单，亦即_____________________。
One of the premier causes is that(注意用词)最重要的原因之一便是______________。
At the risk of sounding too simplistic, it seems to me that the main propositions can be summarized in one saying.这个原因可能较简单，不过，我认为可以用一句谚语来概括，________。
We may look into every possible reason, however, foremost reason for .... Is .... 其实有很多原因，不过，造成________的最重要的原因是______________。
It might also be noted that....需要注意的是，____________。
Another reason why .....(凑字数，但不可滥用) is that....(有利于写长句)
What is also worth noticing is that....值得一提的是___________________。
There is another factor that deserves some words here还有另外一个很重要的原因。
A more essential factor why.... Is that_______ 的更为重要的原因是____________。
A further reason why,,,, is that....________的更深层次的原因是____________。
In addition..此外，再者
Moving on to wider themes,_______ 展开来说，_________________________。
The second thing that must be taken into consideration is that...第二个原因也很重要(值得考虑)，亦即__________。
Likewise(同样), common sense tells us that.同样，___________，这是众所周知的。
The third but very important reason is that...第三个(尽管不是很重要)原因是______________。
The third, not the last is that,第三个原因是___________。
The last factor to be taken seriously is...第三个重要原因是_______________。
Finally, moreover, last but not least, furthermore.
As the proverb goes: "every coin has its two sides", ....is no exception.俗语有云："万事万物都有两面性。" ________也不例外。
Every thing has a good side and a bad side, and ....is no exception.万事万物有其两面性，而________也是如此。
The discussion as to whether the ... is a blessing or a curse arouses most people's interests__________是好坏利弊问题引起了很多人的兴趣。
..plays such an important role that it undeniably becomes the biggest concern of the present world.______ 尤为重要而引起当今社会的关注。
There comes a question: is it a blessing or a curse.问题是：____是福是祸?
There is no denying that every thing has one more face and ... is no exception.不可否认，每一件事物都有其两面性，其实，______也不例外。
Every thing in the world has its own two sides. Without exception, A has both advantages and disadvantages.任何事情都有两面性，A也不例外，有其优势和劣势(利与弊)。
....undoubtedly plays an increasing significant role in modern life.不容置疑，_______在现代生活中不断显示出起重要性。
With the development of the society, ... is increasingly important. 随着社会的发展，_______变得越来越重要。
The merits of this is obvious...其好处显而易见。
As we know, ... bring many benefits and convenience to people.众所周知，_______ 为我们的生活带来很多好处。
There are no less than three advantages in .. as rendered below.如下所示，_______ 至少有三种好处。
Despite the advantages ... has, some people claim, we shall not lose sight of its adverse effects on...尽管_____有些益处(优势)，有些人则认为，我们不能忽略了其对______的负面影响。
However, like anything else,... has more than one face.然而，象其他任何事物一样，______ 还有其它的方面。
However, with the advance of the human civilization, there is an increasing number of people who have raised doubts about whether..然而，随着人类文明的进步，越来越多的人开始置疑是否__________。
Some people deem it is a dangerous signal and call for public awareness of the negative effects it has brought about.有些人认为这是一种危险的信号，因此需关注其给社会带来的负面影响。
Of course, nothing in the world is perfect, so is...当然，时间没有完美的事物，所以，________。
Despite its merits, it also brings some problems to solve.尽管其也有很多优点，不过，也给我们带来一些问题。
But its bright side should not keep us from examining its dark side.但是，我们不能因为这些优点而忽略了其缺点。
From the reasons presented above, I think the pros outweigh the cons.从以上原因可以看出，其优势胜过劣势(优点多于缺点)。
As far as I am concerned, its disadvantages outweigh its disadvantages.
我认为，其优势胜于劣势。
总的说来：In general, all in all, on the whole , in brief, in summary, in conclusion, in short, in a word , to sum up, to conclude, to summarize,...
But all in all, I would say the advantages outweigh the disadvantages. With the advance of society, if we encourage the merits and eliminate the drawbacks, all people will enjoy a better life.
但是，总的说来，我认为其优势大于劣势。随着社会的发展，如果我们能对此善加利用，所有的人都能生活得更好。
From what has been discussed above, we may finally draw the conclusion that... 通过以上的讨论，我们可以得出如下结论，___________。
So, as I see it.. 因此，我个人认为，_________。
What we must do is to encourage the strength and diminish the weaknesses to the least extent.我们必须尽可能发挥其优势，趋吉避凶。
In conclusion, although ... has its negative effects, it can to a great extent bring us more advantages.总的说来，虽然_______ 有其负面的影响，在很大程度上，其也将给我们带来很多好处。
From what has been discussed above, we can see ... does more harm than good to us. Therefore, I strongly approve of the motion that...从以上论述可知，_____ 对我们百害而无一利。