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• Simple past is to express the idea that an action started and finished at a specific time in the past. Sometimes, the speaker may not actually mention the specific time, but they do have one specific time in mind.
• When to use simple present tense?
  • To express habits, general truths, repeated actions or unchanging situations, emotions and wishes.
  • To give instructions or directions.
  • To express fixed arrangements, present or future.
  • To express future time, after some conjunctions: after, when, before, as soon as, and until.