以下是20个英语作文的开头和结尾模板及例句，供参考：

一、开头模板及例句

1. 引用名言式

   • "As George Orwell once said, 'Freedom is the right to tell people what they do not want to hear.'"

   适用场景：论述自由与言论的关系

2. 设问式

   • "Have you ever wondered why some people are more successful than others？"

   适用场景：探讨成功因素

3. 描述场景式

   • "In the small village nestled between the mountains and the sea..."

   适用场景：记叙文或议论文

4. 对比式

   • "On the one hand, technology brings convenience； on the other hand, it poses challenges."

   适用场景：分析利弊

5. 总结归纳式

   • "From what has been discussed above, we may safely draw the conclusion that..."

   适用场景：议论文结论段落

二、结尾模板及例句

1. 总结观点式

   • "In conclusion, effective communication is crucial in today's society."

   适用场景：议论文结尾

2. 展望未来式

   • "I believe that with hard work and perseverance, we can achieve our dreams."

   适用场景：激励类作文

3. 反问式

   • "How can we ignore the importance of protecting the environment？"

   适用场景：环保类议论文

4. 引用诗句式

   • "Knowledge is power, ignorance is folly."

   适用场景：哲理类作文

5. 呼吁行动式

   • "It is time that we take measures to address this pressing issue."

   适用场景：社会问题类议论文

三、扩展建议

• 开头 ：优先使用名人名言或具体事例吸引注意，再引出主题。

• 结尾 ：可重复文章核心观点，或用反问句强化感染力。

• 写作技巧 ：注意段落衔接，使用过渡词（如"Furthermore," "Conversely,"）使文章更流畅。

以上模板可根据具体作文类型调整，建议结合自身论据选择最契合的开头和结尾。