| if条件句中的谓与动词 | 主句的谓与动词 | |
| 与现在的事实相反 |
1. 行为动词用did 形式 2. be动词用were |
should would could + 动词原形 might |
| 与过去的事实相反 |
had + done |
should would could + have + done might |
| 与将来的事实相反 |
1. 行为动词用did 2. should + 动词原形 3. were to + 动词原形 |
should would could + 动词原形 might |
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