1. if条件句三大公式
与现在事实相反：If + did/were, would/could/might do
例：If I were you, I would review these rules.
与过去事实相反：If + had done, would/could/might have done
例：If you had memorized the templates, you would have passed.
与将来事实相反：If + should/were to/did, would/could/might do
例：If it should rain tomorrow, the exam would be postponed.
2. 高频坑点
看见wish/as if/if only直接套公式，时间看从句动词
without/but for替换if：去掉if，主句用虚拟
例：Without your help (=If you hadn’t helped), I would have failed.
混合虚拟：主句和从句时间不一致，各套各的公式
例：If you had reviewed yesterday (过去), you would be confident now (现在).
3. 蒙题口诀
选项有would have done，往前找had done或过去时间词
选项有would do，往前找did/were或现在时间词
If省略倒装见were/had/should开头，直接确定虚拟
4. 作文模板句
开头万能句：If I were to express my view, I would argue that...
建议强硬句：If the government had implemented stricter policies, the problem would have been solved earlier.
结尾升华句：If we are to embrace the future, efforts must be made now.
5. 真题考点
近三年单选必考1题混合虚拟
完形填空常见without/otherwise引导虚拟
作文书信建议段必用If...would...提方案
直接背熟，看见题直接套公式。