The correct answer is 'must'. 'Must' is used for positive deductions when we are almost certain something is true based on evidence. Example: 'She must be tired after working all day.' Other modals: 'can't' is for negative deductions (e.g., 'He can't be the thief'), 'should' expresses expectation (e.g., 'He should arrive soon'), and 'may' indicates possibility. Deduction modals allow us to make informed guesses from clues.

Break down complex topics into smaller, manageable chunks for easier recall.

Zambia

• ivwananji siwale – 29 pts

• Mid-point of A Line
• Equation of a Straight Line
• Parallel and Perpendicular Lines
• Area of Rectilinear Figures
• Distance of A Straight Line