1. PAST
   1. SIMPLE PAST
      1. PAST PROGRESSIVE
   2. PAST PERFECT SIMPLE
      1. PAST PERFECT PROGRESSIVE
2. PRESENT
   1. SIMPLE PRESENT
      1. PRESENT PROGRESSIVE
   2. PRESENT PERFECT SIMPLE
      1. PRESENT PERFECT PROGRESSIVE
3. FUTURE
   1. FUTURE I SIMPLE
      1. FUTURE I PROGRESSIVE
   2. FUTURE II SIMPLE
      1. FUTURE II PROGRESSIVE