八年级下册英语特殊句型主要包括以下类型，结合权威资料整理如下：
一、虚拟条件句
与现在事实相反 If I were you, I would...
*例*：If I were you, I would study harder.（如果我是你，我会更努力。）
与过去事实相反
If I had known you were coming, I would have prepared...
*例*：If I had known you were coming, I would have baked a cake.（如果我知道你要来，我会烤蛋糕的。）
与将来事实相反
If I were to... （will后接动词原形）
*例*：If I were to win the competition, I would travel the world.（如果我获奖了，我会环游世界。）
二、倒装句
部分倒装
否定句：
Neither + 助动词/情态动词 + 主语
*例*：Neither did I finish the task.（我也没有完成任务。）
肯定句：
So + 助动词/情态动词 + 主语
*例*：So did she call you last night.（她昨晚也给你打了电话。）
完全倒装
以疑问词开头：
What/Who/Where + 动词 + 主语
*例*：Where did the meeting start？（会议从哪里开始的？）
三、强调句
结构： It is/was + 被强调部分 + that/who + 其他 *例*： It was his hard work that helped him pass the exam.（是他努力工作帮助他通过考试的。） 四、宾语从句 结构
*例*：
I believe that she will finish the project on time.（我相信她能按时完成项目。）
五、定语从句
结构：先行词 + 关系词（that/which） + 从句
*例*：
The book which/that I borrowed from the library is very interesting.（我从图书馆借的那本书很有趣。）
六、特殊疑问句
结构：特殊疑问词 + 动词 + 其他
*例*：
How long have you been studying English？（你学英语多久了？）
七、其他重要结构
含情态动词的疑问句
*例*：
Can you help me with my homework？（你能帮我做作业吗？）
含情态动词的否定句
*例*：
She can't swim.（她不会游泳。）
以上句型覆盖了八年级下册英语的核心语法点，建议结合例句和练习巩固掌握。
