- The screenshot is from Google search.
- Basically simple present is used for these.
- Habit.
- To give instruction.
- To express arrangement in present or in the future.
- To express future time.
- Simple past is used in these situations.
- Completed action in the past.
- Series of completed action in the past.
- Duration in the past. For example, "I lived in Brazil for 2 years.".
- Past habit.
- Past fact or generalization that happen in the past.
- There is also "when clauses happen first", but this is not so relevant for me now.
- Below are article that explains the usage of simple past, http://www.englishpage.com/verbpage/simplepast.html.
- Below is the full screenshot.
- Simple present is used in these situations.
- Repeated actions.
- Facts or generalizations.
- Scheduled event in the near future.
- Thing that happen now.
- There is also information about adverb placement.
- Below is an article that shows the usage of simple present, http://www.englishpage.com/verbpage/simplepresent.html.
- Below is the full screenshot.