Modal Verbs, Degrees of Certainty: Einstein's Riddle + Grammar Team-Building ESL

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Talkin' Town English
Grade Levels
9th - 12th, Higher Education, Adult Education, Homeschool, Staff
Resource Type
Formats Included
  • Google Docs™
6 + Teacher's
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Talkin' Town English
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Einstein's Riddle is actually a great way for ELLs to practice present modals of certainty and modals of deduction (must be, might be, can't be, etc.) to solve a logic-based puzzle using process of elimination. It's a great team-building activity, class competition, or end-of-the-year challenge. For on-line or in-person intermediate-advanced ESL/EFL/ELLs.



  • Grammar Chart of Modals in the Present Form (must be, has to be, should be, might be, could be, can't be, couldn't be)
  • Grammar Gap Fill (10 Questions)
  • Riddles Warm Up
  • Einstein's Riddle
  • Riddle Chart Organizer Worksheet
  • Teacher's Notes and
  • Solution



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Total Pages
6 + Teacher's
Answer Key
Teaching Duration
3 hours
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