英语三级作文万能句子 英语作文万能句子

1 there are probably three/many/several/varieties of reasons/causes for this dramatic/significant increase/decline in… 引起……显著增长（下降）的原因有三个（许多、几个、很多）。

2 some reasons can explain this trend. first of all,… secondly,… furthermore,… 一些原因可以解释这一趋势。首先，……；其次，……；另外，……

3 why…? for one thing,… for another,… 为什么……？第一，……;第二，……。

4 the causes for…are varied. they include…perhaps the main cause is… 造成……的原因有很多，包括……。主要的原因可能是……

5 perhaps the main/primary/fundamental/most important reason is… 也许，最主要（根本、重要）的原因是……

6 the reason for this is not far to seek. the first reason is that…the second one is…the third is… for all this, the main cause of…is due to… 这一问题的原因不难发现。第一个原因是……。第二个是……。第三个是……。综上所述，……最主要的原因应该是……

7 it is no easy task to identify the reasons for this phenomenon which involves several complicated factors.要找出这一现象的原因并非易事，因为它涉及若干复杂的因素。

8 certainly,…is not the sole reason for…；…is also responsible for the change/problem.当然，……并不是唯一的原因。还有……也导致了这一变化（问题）的产生。

9 you dont have to look very far to find out/identify the reason why… 你不必花费很大的力气就会找到……的原因。

10 there are numerous reasons why…,and i would explore only a few of the most important ones here.……的原因有很多，在此我只想探讨其中几个最重要的原因。