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The reason why I will fail to join you for the party is that I have something urgent to attend to.
（2021北京卷；主题·人际交往；应用文——道歉信）
我之所以不能参加你们的聚会，是因为我有急事要办。
核心句型
The reason why ... is that ...
……的原因是……
用于阐述某个现象、观点或决定背后的原因
The reason why I am suggesting that you consider studying abroad is that I believe it will broaden your horizons and enhance your language skills. 我建议你考虑出国留学的原因是，我相信这会开阔你的视野，提高你的语言能力。（建议信）
The reason why I cannot accept the invitation is that I have prior commitments that I cannot reschedule. 我不能接受邀请的原因是，我有事先安排好的工作，无法改期。（道歉信）
The reason why our team excelled in the competition is that we supported each other throughout. 我们团队在比赛中表现出色的原因是，我们始终相互支持。（发言稿）
The reason why I'm passionate about environmental conservation is that I want to leave a better planet for future generations. 我热衷于环境保护的原因是，我想为子孙后代留下一个更好的地球。（倡议书）
核心词表
fail to do sth. 没能做成某事
urgent [ˈɜːdʒənt] adj. 紧急的
attend to 处理；照料
主题句型
在陈述道歉的理由时常用的表达有：
1. The reason is that ... 原因是……
2. The underlying cause of ... lies in the fact that ... ……的根本原因在于……这个事实。
3. The explanation why ... is rooted in ... ……的原因是……
4. The fundamental reason for ... is ... ……的根本原因在于……
实际应用
The reason is that my right foot was injured. I fell off my bike yesterday when I was on my way to school. 原因是我的右脚受伤了。昨天我在上学的路上从自行车上摔了下来。
The underlying cause of my absence lies in the fact that I had to take care of a sick family member. 我缺课的根本原因是，我必须要照顾一个生病的家人。
The explanation why I will fail to go there for our appointment is rooted in the necessity of participating in a family get-together tomorrow. 我不能赴约的原因是，我必须参加明天的家庭聚会。
The fundamental reason for my delay is the heavy traffic. 我迟到的根本原因在于交通拥堵。
写作思路
真题举例——以2021年北京卷为例
假设你是李华。你和英国好友Jack原定本周末一起外出，你因故不能赴约。请你用英文给他写一封电子邮件，内容包括：
（1） 表达歉意并说明原因；
（2） 提出建议并给出理由。
