| 1) things in general -
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| 2) actions began and finished in the past -
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| 3) actions happening at the moment of speaking -
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| 4) actions happened in the past - the results of them are important in the present -
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| 5) actions in the present - one follows the other -
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| 6) actions in the past - one followed the other -
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| 7) actions started in the past and continue up to the present -
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| 8) this action was in progress when a new action interrupted it -
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| 9) repeated actions in the present -
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| 10) predictions in the future -
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| 11) actions express plans in the future -
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| 12) fixed plans in the near future -
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| 13) fixed arrangements (timetable) -
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