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“By the time she arrived at the conference hall, we _______ dinner.”
Grammar Principle
Past Perfect (had + past participle) describes an action completed before another past event. Eating finished before she arrived, so "had already eaten" is the only accurate choice.
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Past Simple vs. Past Continuous
Spot interrupted actions and use "when" versus "while" correctly.
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Master unreal past hypotheticals with "had + past participle" and "would have done".
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Rule Insight
Why not "have eaten"? The sentence sets a past reference point ("arrived"). Present perfect connects the past to now, while past perfect anchors an action before that past moment.
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Grammar-Pack-B2-Conditionals.pdf
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