Plants if they don’t get the sun and water (die) 6. If you don’t study harder, you the final exam (not pass) 7. She terribly sorry if he dies (feel) 8. If he much money, he’ll buy a new house (have) 9. If the rice paddies polluted, the rice plants will die (be) 10. Unless you understand, I it again to you (explain) 11.
The correct answer is "had switched, would not have fallen." This is because the sentence is a conditional type 3 sentence, which indicates a hypothetical situation in the past. The use of "had switched" in the if-clause indicates the past perfect tense, and "would not have fallen" in the main clause indicates the conditional perfect tense.
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type 2 conditional sentences