Past Tense Vs Past Perfect Tense

• PAST TENSE Vs PAST PERFECT TENSE
  
  It means that to show events which the first event (happened) use Simple Past Perfect and the second event use Simple Past Tense. It can use the conjunctions: Before, When, and After.
  
  @ Before I studied English, I had prayed to Allah in the classroom.
  
  Or
  @ I had prayed to Allah in the classroom Before I studied English.
• 
  
  * When Sherly came late in the class, I had taught mathematic.
  Or
  * I had taught mathematic when Serly came late in the class.
  
  # After I had gone to the Kalimantan, I fell in love with Fanny
  Or
  # I fell in love with Fanny After I had gone to the Kalimantan
  
  The Pattern:
  
  SIMPLE PAST TENSE : S + V2 + C
  PAST PERFECT TENSE: S + had + V3 + C
  
  Past Perfect Tense Before Past Tense
  Or
  Before Past Tense, Past Perfect Tense
  
  
  
  Past Perfect Tense When Past Tense
  Or
  When Past Tense, Past Perfect Tense
  
  
  
  Past Tense After Past Perfect Tense
  Or
  After Past Perfect Tense, Past Tense