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Grammar exercises · 12 questions

Modals of deduction exercises

In short

Test yourself on modals of deduction with 12 interactive questions. Every answer comes with an explanation — and if you get one wrong, the AI tutor can explain exactly why your answer didn't work.

Question 1 of 12

The office is dark and the door is locked — everyone ___ home.

Shaky on the rule?

Guessing gets you through a quiz; understanding gets you through the exam. Read the full Modals of deduction lesson — Modals of deduction — must, might/may/could, and can't — let a speaker judge how likely something is from the evidence available, not state it as fact. Present deduction uses modal + be or base verb ('must be', 'might work'); past deduction uses modal + have + past participle ('must have left', 'can't have known'). Must shows near-certainty, might/may/could show possibility, and can't shows impossibility.

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