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，小编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/recognized that 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

　　在四级写作中，很多时候我们都需要提到自己的观点，这时，同学们的头脑里估计会本能的蹦出 “I think”或者是 “in my opinion”之类的句式。如果这样的话，请对这些词说拜拜吧，因为，你已经不需要它们了。只要你愿意，你将学会以下其他表达方式：

　　1. I reckon, 用于阐述自己的观点，比 “I think I”更正式。

　　e.g. I reckon it will be much faster to get to London by train。

　　2. In my view,比 “in my opinion更正式，经常用于讨论重要的事情。

　　e.g. In my view, they made a huge mistake in not selling the company when they had the chance。

　　3. It seems to me & All things considered，皆可用于仔细思考问题或局势时。

　　e.g. (i) It seems to me that they are spending more money than they need to attract new talent into the company。

　　(ii) All things considered, I think we made a wise choice in recruiting James。

　　4. If you ask me，用于当你的观点于对方十分重要时；

　　e.g. If you ask me, she has spoilt her children far too much。

　　不过有时人们会在没被提问的情况下用到此句；

　　e.g. “If you ask me,…。。” “But I didn’t ask you….!”

　　5. To be honest &To tell you the truth &To be frank，皆用于知道对方可能不喜欢你的观点时。

　　e.g. (i) To tell you the truth, your father was right when he said that you undersold the company。

　　(ii) To be honest, I preferred it when you were blonde。

　　(iii) To be frank, I thought her acting was simply terrible。

　　6. Frankly speaking，更加直白的方式，用于熟悉的人。

　　e.g. (i) You would use this expression to give your opinion in a more familiar and forthright way。

　　(ii) Frankly speaking, I don’t know what she sees in him。

　　7. Personally，这用于强调自己在阐述个人观点时。

　　e.g. (i) This is used to emphasize that you are giving your own opinion

　　(ii) Personally, I think the CEO should apologize for his appalling behavior at the shareholders’ meeting。

　　8. To my mind& As far as I’m concerned，皆可用于对方不同意你的观点时。

　　e.g. (i) To my mind, private education is better than state education。

　　(ii) As far as I’m concerned, tennis is a much more interesting sport than football。

　　这样以来，除了“I think” 和“in my opinion”，你仍有N种方式可以用于陈述观点，何乐而不为呢？(来源：沪江英语)