| 1. | （仮定法過去） | If she worked harder, she would succeed. | |
| | | If she worked harder, she succeed. | |
| | | If she worked harder, she would have succeeded. | |
| | | If she have worked harder, she would succeed. | |
| | | If she had worked harder, she would succeed. | |
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| 2. | （仮定法過去） | If you arrived at the airport by 15 o’clock, you could have met her before departure. | |
| | | If you arrived at the airport by 15 o’clock, you meet her before departure. | |
| | | If you arrived at the airport by 15 o’clock, you could meet her before departure. | |
| | | If you have arrived at the airport by 15 o’clock, you could meet her before departure. | |
| | | If you had arrived at the airport by 15 o’clock, you could meet her before departure. | |
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| 3. | （仮定法過去） | If you tried again, you pass. | |
| | | If you tried again, you might pass. | |
| | | If you tried again, you might have passed. | |
| | | If you have tried again, you might pass. | |
| | | If you had tried again, you might pass. | |
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| 4. | （仮定法過去完了） | If I have known earlier I could have done it. | |
| | | If I had known earlier I could do it. | |
| | | If I had known earlier I have done it. | |
| | | If I knew earlier I could have done it. | |
| | | If I had known earlier I could have done it. | |
| | | If I had known earlier I done it. | |
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| 5. | （仮定法過去完了） | If we haven't spent three hours in a traffic jam, we could have seen the aquarium. | |
| | | If we hadn't spent three hours in a traffic jam, we could seen the aquarium. | |
| | | If we hadn't spent three hours in a traffic jam, we have seen the aquarium. | |
| | | If we hadn't spent three hours in a traffic jam, we saw the aquarium. | |
| | | If we didn't spend three hours in a traffic jam, we could have seen the aquarium. | |
| | | If we hadn't spent three hours in a traffic jam, we could have seen the aquarium. | |
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