{"id":2545,"date":"2026-01-05T07:57:06","date_gmt":"2026-01-05T07:57:06","guid":{"rendered":"https:\/\/www.englishtestcenter.com\/?p=2545"},"modified":"2026-01-04T12:01:40","modified_gmt":"2026-01-04T12:01:40","slug":"modals-of-deduction-ielts-toefl-yds-practice-b2-grammar-test","status":"publish","type":"post","link":"https:\/\/www.englishtestcenter.com\/index.php\/modals-of-deduction-ielts-toefl-yds-practice-b2-grammar-test\/","title":{"rendered":"Modals of Deduction (IELTS, TOEFL, YDS Practice) – B2 Grammar Test"},"content":{"rendered":"

Modals of Deduction (IELTS, TOEFL, YDS Practice) – B2 Grammar Test<\/h3>\n

This B2 grammar test<\/strong> focuses on modals of deduction<\/strong>, which are used to express certainty, probability, and impossibility<\/strong> based on evidence.
Choose the correct answer.<\/p>\n

QUIZ START<\/a><\/div>\n

A1 Online Grammar Exercises<\/a><\/p>\n

A2 Online Grammar Exercises<\/a><\/p>\n

B2 Online Grammar Exercises<\/a><\/p>\n

✅ Answer Key with VERY DETAILED EXPLANATIONS<\/strong><\/h2>\n

🧠 B2 Modals of Deduction \u2013 Exam Logic<\/h3>\n
\n

🔑 Core Concept (Read First)<\/h2>\n

Modals of deduction express how certain the speaker is<\/strong>, based on evidence.<\/p>\n

\n
\n\n\n\n\n\n\n\n
Modal<\/th>\nMeaning<\/th>\n<\/tr>\n<\/thead>\n
must<\/strong><\/td>\nstrong logical certainty<\/td>\n<\/tr>\n
might \/ may<\/strong><\/td>\npossibility (50% or less)<\/td>\n<\/tr>\n
can\u2019t<\/strong><\/td>\nlogical impossibility<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

These modals are not about rules or permission<\/strong>, but about logical inference<\/strong>.<\/p>\n

\n

1. can\u2019t<\/strong><\/h3>\n

The evidence strongly suggests they are not at home. If the lights are off and nobody answers, being at home is logically impossible.<\/p>\n

    \n
  • \n

    ❌ must<\/em> \u2192 certainty in the opposite direction<\/p>\n<\/li>\n

  • \n

    ❌ might<\/em> \u2192 too weak for the evidence<\/p>\n<\/li>\n<\/ul>\n

    📌 Typical YDS deduction<\/strong> question<\/p>\n

    \n

    2. must<\/strong><\/h3>\n

    Studying all night is strong evidence of exhaustion. The speaker is almost certain.<\/p>\n

      \n
    • \n

      ❌ might<\/em> \u2192 uncertainty not justified<\/p>\n<\/li>\n

    • \n

      ❌ can\u2019t<\/em> \u2192 contradicts evidence<\/p>\n<\/li>\n<\/ul>\n

      📌 IELTS Speaking inference<\/p>\n

      \n

      3. might<\/strong><\/h3>\n

      The speaker is unsure and only suggests a possibility.<\/p>\n

        \n
      • \n

        ❌ must<\/em> \u2192 too certain<\/p>\n<\/li>\n

      • \n

        ❌ can\u2019t<\/em> \u2192 no evidence of impossibility<\/p>\n<\/li>\n<\/ul>\n

        📌 TOEFL listening-style reasoning<\/p>\n

        \n

        4. must<\/strong><\/h3>\n

        A restaurant that is always full is logically very good.<\/p>\n

          \n
        • \n

          ❌ might<\/em> \u2192 weak conclusion<\/p>\n<\/li>\n

        • \n

          ❌ can\u2019t<\/em> \u2192 illogical<\/p>\n<\/li>\n<\/ul>\n

          📌 Common IELTS inference pattern<\/p>\n

          \n

          5. can\u2019t<\/strong><\/h3>\n

          Someone who has just eaten a large meal is logically not hungry.<\/p>\n

            \n
          • \n

            ❌ must<\/em> \u2192 opposite meaning<\/p>\n<\/li>\n

          • \n

            ❌ might<\/em> \u2192 contradicts strong evidence<\/p>\n<\/li>\n<\/ul>\n

            📌 YDS cause\u2013effect logic<\/p>\n

            \n

            6. can\u2019t<\/strong><\/h3>\n

            If she had seen the message, she would probably have replied. This suggests impossibility.<\/p>\n

              \n
            • \n

              ❌ must<\/em> \u2192 certainty without proof<\/p>\n<\/li>\n

            • \n

              ❌ might not<\/em> \u2192 weaker than required<\/p>\n<\/li>\n<\/ul>\n

              📌 Advanced past deduction<\/p>\n

              \n

              7. must<\/strong><\/h3>\n

              The absence of the keys strongly suggests they were left elsewhere.<\/p>\n

                \n
              • \n

                ❌ can\u2019t<\/em> \u2192 illogical<\/p>\n<\/li>\n

              • \n

                ❌ would<\/em> \u2192 conditional, not deduction<\/p>\n<\/li>\n<\/ul>\n

                📌 TOEFL past inference<\/p>\n

                \n

                8. must<\/strong><\/h3>\n

                Confidence is strong evidence of knowledge.<\/p>\n

                  \n
                • \n

                  ❌ can\u2019t<\/em> \u2192 contradiction<\/p>\n<\/li>\n

                • \n

                  ❌ might not<\/em> \u2192 unlikely<\/p>\n<\/li>\n<\/ul>\n

                  📌 IELTS Speaking evaluation language<\/p>\n

                  \n

                  9. might<\/strong><\/h3>\n

                  A delay is possible but not certain.<\/p>\n

                    \n
                  • \n

                    ❌ must<\/em> \u2192 too strong<\/p>\n<\/li>\n

                  • \n

                    ❌ can\u2019t<\/em> \u2192 no impossibility<\/p>\n<\/li>\n<\/ul>\n

                    📌 TOEFL uncertainty marking<\/p>\n

                    \n

                    10. can\u2019t<\/strong><\/h3>\n

                    Looking far too young makes the conclusion logically impossible.<\/p>\n

                      \n
                    • \n

                      ❌ must<\/em> \u2192 opposite conclusion<\/p>\n<\/li>\n

                    • \n

                      ❌ might<\/em> \u2192 uncertainty not appropriate<\/p>\n<\/li>\n<\/ul>\n

                      📌 YDS appearance-based deduction<\/p>\n

                      \n

                      11. must<\/strong><\/h3>\n

                      Knocking at the door is strong evidence that the courier has arrived.<\/p>\n

                        \n
                      • \n

                        ❌ can\u2019t<\/em> \u2192 illogical<\/p>\n<\/li>\n

                      • \n

                        ❌ would<\/em> \u2192 hypothetical<\/p>\n<\/li>\n<\/ul>\n

                        📌 IELTS real-life inference<\/p>\n

                        \n

                        12. must<\/strong><\/h3>\n

                        Forgetting is the most logical explanation for missing the meeting.<\/p>\n

                          \n
                        • \n

                          ❌ can\u2019t<\/em> \u2192 no contradiction<\/p>\n<\/li>\n

                        • \n

                          ❌ will<\/em> \u2192 future prediction<\/p>\n<\/li>\n<\/ul>\n

                          📌 TOEFL reasoning tasks<\/p>\n

                          \n

                          13. must<\/strong><\/h3>\n

                          Wet ground strongly suggests rain occurred.<\/p>\n

                            \n
                          • \n

                            ❌ can\u2019t<\/em> \u2192 contradicts evidence<\/p>\n<\/li>\n

                          • \n

                            ❌ might not<\/em> \u2192 illogical<\/p>\n<\/li>\n<\/ul>\n

                            📌 Science-related deduction<\/p>\n

                            \n

                            14. can\u2019t<\/strong><\/h3>\n

                            A completely wrong answer suggests misunderstanding.<\/p>\n

                              \n
                            • \n

                              ❌ must<\/em> \u2192 wrong direction<\/p>\n<\/li>\n

                            • \n

                              ❌ might<\/em> \u2192 too weak<\/p>\n<\/li>\n<\/ul>\n

                              📌 YDS inference elimination<\/p>\n

                              \n

                              15. might<\/strong><\/h3>\n

                              Driving is a possible explanation, but not certain.<\/p>\n

                                \n
                              • \n

                                ❌ must<\/em> \u2192 too strong<\/p>\n<\/li>\n

                              • \n

                                ❌ can\u2019t<\/em> \u2192 no evidence<\/p>\n<\/li>\n<\/ul>\n

                                📌 IELTS everyday deduction<\/p>\n

                                \n

                                🧠 B2 Exam Survival Summary<\/h2>\n
                                  \n
                                • \n

                                  Use must<\/strong> when evidence is strong<\/p>\n<\/li>\n

                                • \n

                                  Use might \/ may<\/strong> when evidence is uncertain<\/p>\n<\/li>\n

                                • \n

                                  Use can\u2019t<\/strong> when something is logically impossible<\/p>\n<\/li>\n<\/ul>\n

                                  At B2 level, exams test reasoning strength<\/strong>, not grammar labels.<\/p>\n","protected":false},"excerpt":{"rendered":"

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