moon7296 Why does the past perfect come when the verb is the simple past tense in #2 and #4? I think that's because when past perfect is used in combination with past simple, that's to clear the order of the events in the past or to emphasize which of the two events in the past happened / occurred earlier. You can also use the past simple in that construction where the 'past perfect' is used, for example, you could say No sooner did Tim leave than the phone rang OR No sooner did he go to bed than he heard a strange sound.
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moon7296Why does the past perfect come when the verb is the simple past tense in #2 and #4?I think that's because when past perfect is used in combination with past simple, that's to clear the order of the events in the past or to emphasize which of the two events in the past happened / occurred earlier.
LaboriousYou can also use the past simple in that construction where the 'past perfect' is used, for example, you could say No sooner did Tim leave than the phone rangOh, really? Yesterday, I saw one pdf file that says in that kind of structure only past perfect(had + a participle) comes. How should I take this "no sooner" structure?