Modals for Deduction, Possibility, and Obligation

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Analyzing Author's Purpose, Tone, and Bias

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question 1 of 14 Grade: Eleven - G11

Q: The modal 'must' can only be used for obligation and never for deduction.

A lid traps the hot air above the water, reducing heat loss by convection and evaporation. It also prevents heat loss by radiation.

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A lid traps the hot air above the water, reducing heat loss by convection and evaporation. It also prevents heat loss by radiation.

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