1.And I would like to present two explanations for this:
对于此，我有如下两点愚见：

2.The reasons are chiefly as follows. 主要原因如下：

3.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

4.The reasons are presented below. 原因如下。

5.There are three premier(主要的)/best/ most important, largest, significant, obvious, crucial causes as follows.

6.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.

7.这基于以下的原因。
The main reason is that.. 主要原因是_____________。

8.One very important argument for ..... is that....
_______的非常重要的原因便是____________________。

9.The reasons are quite clear. Above all, ....
原因非常清楚。首先(首要的是)__________。

10.The first reason can be seen by every person.
第一个原因其实很明显。

引出开头

1：It is well-known to us that……(我们都知道……)==As far as my knowledge is concerned, …( 就我所知…)

2：Recently the problem of…… has been brought into focus. ==Nowadays there is a growing concern over ……(最近……问题引起了关注)

3：Nowadays(overpopulation)has become a problem we have to face.(现今，人口过剩已成为我们不得不面对的问题)

4：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)

5：With the rapid development of science and technology，more and more people believe that……(随着科技的迅速发展，越来越多的人认为……)

6：It is a common belief that……==It is commonly believed that……(人们一般认为……)

7：A lot of people seem to think that……(很多人似乎认为……)

8:It is universally acknowledged that + 句子(全世界都知道...)

表达不同观点

1：People's views on……vary from person to person. Some hold that……However, others believe that……(人们对……的观点因人而异，有些人认为……然而其他人却认为……)

2：People may have different opinions on……(人们对……可能会持有不同见解)

3：Attitudes towards (drugs)vary from person to person.==Different people hold different attitudes towards(failure)(人们对待吸毒的态度因人而异)

4:There are different opinions among people as to……(对于……人们的观点大不相同)

正反观点对比题目

第一段一般只写三句

第一句：It is widely believed that by many people for some time that ...

第二句：One reason they think is that...

第三句：The ohter reason they hold is that...

第二段一般只写三句

第一句：While others argue that ...

第二句：They maintain that...

第三句：They also claim  that...

第三段写四句

第一句：From what has been discussed above, we may come to the conclusion that ...

第二句：On the one hand, ...

第三句：On the other hand, ...

第四句：Only in this way can we ...

图表作文

第一段只写三句：

第一句：As is shown in the graph above, we can see clearly that great changes have taken place in … from…to…

第二句：The first … years saw…

第三句：The last … years witnessed …

第二段只写四句：

第一句：What has caused this problem? It seems to me that there are … reasons.

第二句：Firstly, …

第三句：Secondly,…

第四句：Finally,…

第三段只写四句：

第一句：How to solve the problem has become a hot issue among many people.

第二句：For one thing, …

第三句：For another, …

第四句：Only in this way can we successfully solve the problem.