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Use the present perfect for situations that involve both the past and the present.

1. Actions or states that started in the past and continue into the present
   I have worked for Hilton Hotels for ten years.
   → I still work for them.
2. Past actions with a present result
   Damian has worked late.
   → He’s probably tired right now. (The focus is on the result in the present.)
3. Past actions that occurred in an unfinished time frame.
   They have archived those files today.
   → The day is not finished yet.

Use the simple past (a) for situations that are limited to a specific moment or period in the past. Use the simple present (b) to express facts and general statements.

1. 1. Actions or states that finished in the past
      I worked for Hilton Hotels for ten years.
      → I don’t work there anymore.
   2. Actions or states presented without a time reference
      I work for Hilton Hotel.
      → I do not give any information about specific time frames.
2. 1. Focus on the past actions
      Damian worked late last night.
      → This is simply information on what Damian did last night.
   2. Facts or habits
      Damian works late at night.
      → In general, Damian works the evening shift.
3. 1. Past actions that occurred in a finished time frame.
      They archived those files yesterday.
      (Yesterday is finished.)
   2. Habits and repeated actions
      They archive files.
      (It’s their job.)