1.开头

Recently， the problem of … has aroused people’s concern.

最近，…问题已引起人们的关注.

Internet has been playing an increasingly important role in our day-to-day life. It has brought a lot of benefits but has created some serious problems as well.

互联网已在我们的生活中扮演着越来越重要的角色.它给我们带来了许多好处，但也产生了一些严重的问题.

Nowadays， (over population) has become a problem we have to face.

如今，(人口过剩)已成为我们不得不面对的问题了.

Many people insist that… 很多人坚持认为……

With the development of science and technology， more and more people believe that… 随着科技的发展，越来越多的人认为…

A lot of people seem to think that… 很多人似乎认为…

2.提出建议

It is high time that we put an end to the (trend). 该是我们停止这一趋势的时候了.

It is time to take the advice of … and to put special emphasis on the improvement of …

该是采纳…的建议，并对…的进展给予特殊重视的时候了.

There is no doubt that enough concern must be paid to the problem of …

毫无疑问，对…问题应予以足够的重视.

Obviously，If we want to do something… ， it is essential that…

显然，如果我们想做某事，很重要的是…

only in this way can we… 只有这样，我们才能…

It must be realized that… 我们必须意识到…

3.预示后果

Obviously， if we don’t control the problem， the chances are that… will lead us in danger.

很明显，如果我们不能控制这一问题，很有可能我们会陷入危险.

No doubt， unless we take effective measures， it is very likely that…

毫无疑问，除非我们采取有效措施，很可能会…

It is urgent that immediate measures should be taken to stop the situation.

很紧迫的是，应立即采取措施阻止这一事态的发展.

论证部分

From my point of view， it is more reasonable to support the first opinion rather than the second.

在我看来，支持第一种观点比支持第二种观点更有道理.

I cannot entirely agree with the idea that… 我无法完全同意这一观点….

Personally， I am standing on the side of …就个人而言，我站在…的一边.

I sincerely believe that… 我真诚地相信…

In my opinion， it is more advisable to do … than to do….

在我个人看来，做…比做…更明智。

Finally， to speak frankly， there is also a more practical reason why…

坦诚地说，最后，还有一个较为实际的原因。

4.给出原因

This phenomenon exists for a number of reasons. First， … Second， … Third， …

这一现象的存在是有许多原因的.首先， … 第二， … 第三， …

Why did… ? For one thing… For another…. Perhaps the primary reason is…

为什么会…? 一个原因是… 令一个原因是…或许其主要原因是…

I quite agree with the statement that… the reasons are chiefly as follows.

我十分赞同这一论述，即…，其主要原因如下。