Present Modals of Deduction

Calculator: It must be something that solves problems. It might have buttons but isn’t a phone. It can’t be used to write sentences.

Compass (for drawing circles): It might be something used in geometry. It must involve a sharp point and a pencil. It can’t be a ruler.

Thermometer: It must be something that measures something invisible. It might be used when you feel unwell. It can’t be used to measure time.

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