Divide marker words into simple groups.

• Группы
  • The Present Simple Tense
  • The Past Simple Tense
  • The Future Simple Tense
• Варианты
  • usually
  • yesterday
  • tomorrow
  • often
  • always
  • sometimes
  • seldom
  • every day
  • never
  • last week
  • last month
  • last year
  • two days ago
  • in 2010
  • the day after tomorrow
  • next week
  • in 5 days
  • some day
  • one of these days