四级作文开头结尾万能句子可归纳为以下五类，涵盖不同场景需求：

一、段首引入句型

现象描述

- "Recently, the problem of..." 引出社会热点问题

- "Nowadays it is common to hear..." 描述普遍现象

- "According to the statistics..." 基于数据展开

观点对比

- "People’s views on..." 展示多元观点

- "Some think..." + "others believe..." 对比不同立场

- "In my opinion..." 表达个人观点

引用俗语/经验

- "There is an old saying..." 结合传统智慧展开

- "As far as my knowledge is concerned..." 引用权威观点

二、结论总结句型

总结归纳

- "From what has been discussed..." 总结全文观点

- "Taking all these factors into consideration..." 综合分析后得出结论

- "Therefore..." 引导结论性陈述

强调建议/措施

- "It is high time that..." 提出紧迫建议

- "I strongly recommend that..." 明确行动方向

- "Given the reasons..." 基于分析提出方案

三、过渡衔接句型

因果关系

- "As a result..." 引导结果

- "Consequently..." 表示顺承

- "Therefore..." 强调因果逻辑

对比转折

- "However..." 引出转折

- "What makes things worse is that..." 深化问题

- "On the contrary..." 反驳前文观点

四、强调重要性句型

紧迫性

- "It must be realized that..." 强调必要性

- "The issue has been brought into focus..." 突出关注度

- "Clearly..." 直接点明核心

可行性

- "Only in this way can we..." 提出唯一解决方案

- "Given the circumstances..." 说明条件限制

- "It is essential that..." 强调行动要求

五、数据支撑句型

图表描述

- "According to the statistics..." 基于数据说明

- "The table reveals..." 展示具体数据

- "It can be seen from the figure..." 通过图形分析

现象解释

- "The issue is closely related to..." 分析关联性

- "Compared with..." 进行横向对比

- "The root cause lies in..." 指出问题本质

使用建议：

根据作文主题选择对应句型，注意保持逻辑连贯。例如，描述现象用数据句型，提出结论用总结句型，论证观点时穿插过渡词增强说服力。