首先，在介绍句子前，我们先来看一些常见的替换词。在四级写作中，为了让句子更显美观大方，词的使用也需多加注意，因此，平日就需要准备一些略显高大上的同义词，以随时攻陷阅卷老师的芳心。下面就列举一些最常见的形容词“备胎”，请记得勤换哦!

明显的：obvious=apparent=evident=manifest

优秀的：excellent=eminent=top=outstanding

惊人的：surprising=amazing=extraordinary=miraculous

消极的，不良的：bad=detrimental=baneful=undesirable

美丽的：beautiful=attractive=gorgeous=eye-catching

积极的，好的：good=conducive=beneficial=advantageous

贫穷的：poor=needy=impoverished=poverty-stricken

有活力的：energetic=dynamic=vigorous=animated

健康的：healthy=robust=sound=wholesome

富裕的：rich=wealthy=affluent=well-to-do=well-off

流行的：popular=prevailing=pervasive

介绍了写作词汇的“备胎”后，我们言归正传，回到句型上来。首先是议论文的句型。议论文一直为写作的难点之一，相比其他题材，它更需要精确的句式来进行客观的阐明，而不是主观阐述。但往往同学们会陷在以“I”， “we”打头的句式中无法自拔。如何学会角度客观呢?请看以下句式吧!

1. It is considered /thought that 人们(有人，大家)认为

2. It is generally /usually accepted /agreed/recognizedthat 普遍(一般，通常)认为

3. It is believed that 有人(人们，大家)相信

4. It is well-known that 大家知道(众所周知)

5. It is said that 据说(有人说)

6. It is learned that 据闻(悉)

7. It is supposed that据推测

8. It is estimated/predicted/calculated that据估计(预计)

9. It must be pointed that 必须指出

10. It is reported that据报道

11. It must be admitted that必须承认

12. It will be seen that 可见(可以看出)

13. It will be seen from this that 由此可见

14. It is understood that不用说(都知道)

15. It can not be denied that无可否认

16. It has been proved/demonstrated that已经证明

17. It may be confirmed that 可以肯定

18. It may be safely said that可以有把握地说

19. It is sometimes asked that人们有时会问

20. It is expected that/hoped that人们希望

21. When it comes to 要说到，要谈及

来源：新东方在线四六级