Which sentence correctly uses a perfect modal to express speculation?
- Hercules must discover his true strength before fighting the Hydra.
- Hercules must have discovered his true strength before fighting the Hydra.
- Hercules might discovering his true strength before fighting the Hydra.
- Hercules should discover his true strength before fighting the Hydra.
Explanation
Must have + past participle indicates a strong guess about a past event (he almost certainly discovered his strength before that battle).
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