核心规则
英语可通过 It is/was ... that/who ... 强调句、助动词 do、倒装、词汇和重读突出信息。强调结构应在去掉框架后仍能恢复一个基本完整、时态合理的句子。
结构与例句
普通句 Li Hua solved the problem yesterday 可变为：It was Li Hua who solved the problem yesterday；It was the problem that Li Hua solved yesterday；It was yesterday that Li Hua solved the problem。
对谓语进行强调时使用 do/does/did + 动词原形：I do understand your concern；She did complete the task。
使用场景
强调句可突出主语、宾语和状语，不能直接强调谓语。疑问式为 Was it yesterday that...?；特殊疑问式为 When was it that...?
常见错误
错误： It was yesterday when we met. → 若为强调结构，通常写 It was yesterday that we met。
错误： She did completed the task. → did 后用动词原形 complete。
易混知识点
It is ... that ... 也可能是普通“it + 系表 + 从句”结构。检验方法是去掉 It is/was 和 that/who：若能还原完整句且意义基本不变，通常是强调句。
总结
选择与焦点匹配的强调手段，并检查强调框架、时态和原句结构是否一致。
提高类 · 强调句型与谓语强调
高中学习重点
强调人时可用 who 或 that，强调其他成分通常用 that。强调句中的 be 根据原句时间用 is/was，但被强调部分的人称和数不决定 be：It is my parents who encourage me。
not...until 的强调结构为 It was not until ... that ...，that 后恢复陈述语序：It was not until midnight that the work was finished。与 Not until 置首引起的倒装不要混淆。
小练习
- 强调地点：We first met in the library.
- 改错：It was Tom that did solved the problem.
- 用强调句改写：We did not understand the rule until the teacher explained it again.
参考答案
- It was in the library that we first met。
- 去掉 did，写 It was Tom that/who solved the problem。
- It was not until the teacher explained it again that we understood the rule。