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3 Which action happened first
Pliny wrote about a devastating volcanic eruption that he had witnessed a s a young man
Before the eruption occurred, Pompeii had been a thriving Roman city…3
The bodies of people had decayed many centuries before archaeologists arrived
But these bodies had left an impression in the ash that showed exact shapes
1111*Which tense is used to talk about
*Which tense is used to talk about
1 an event in the past
2 an event that happened earlier, before the other past event in the story
Past simplePast simplePast PerfectPast Perfect** 在他们到达旅馆之前,他们已经吃早饭了
在他们到达旅馆之前,他们已经吃早饭了
They They hadhad already already hadhad breakfast before breakfast before they arrived at the hotel
they arrived at the hotel
** 当警察到达的时候当警察到达的时候 ,, 那些贼已经逃跑了
那些贼已经逃跑了
When th