YET: YOUR ESL TEACHER - PAST PERFECTe
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Past Perfect

Two events that happened in the past, one before the other.
​​Same problem as Present Perfect.
      
Not commonly used in some languages.

Makes it difficult to learn to use in English.

However, this is "a must learn" grammar.
had + past participle verb + past tense verb
EXAMPLES:
 
  1. John was at the airport for an hour.   The airline cancelled his flight.

    John had been at the airport for an hour when the airline cancelled his flight.

  2. I was in Rio just one day.     I got robbed.

    I had been in Rio just one day when I got robbed.  CLS

  3. I worked in Paris for a year.   I moved to California.

    I had worked in Paris for a year, before I moved to California.

  4. You met your wife in Bogota.  How long were you there.

    When you met your future wife Bogota, h    ow long had you been there?
    ​
NOTE:  Other tenses

  • PAST TENSE:     I conducted interviews all day yesterday.
     
  • PRESENT TENSE:   I conduct interviews every day.

  • FUTURE TENSE:   I will conduct interviews all day tomorrow.  

  • PRESENT PERFECT:  I have conducted interviews since Monday.

  • PAST PERFECT:   I had conducted interviews all day when I began to feel bad.