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SPECULATIONS AND
DEDUCTIONS
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SPECULATIONS AND DEDUCTIONS WITH MODAL VERBS
• IN THE PRESENT
• MUST + INFINITIVE: He must be a teacher (He has lots of exams to correct)
• MAY/MIGHT/COULD + INFINITIVE: He may/might/could be a teacher (He has a lot of holidays)
• CAN’T / COULDN’T + INFINITIVE: He can´t be a teacher (He works at the weekends)
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SPECULATIONS AND DEDUCTIONS WITH MODAL VERBS
• IN THE PRESENT , but CONTINUOUS
• MUST + CONTINUOUS INFINITIVE: He must be working now (It is five o’clock)
• MAY/MIGHT/COULD + CONTINUOUS INFINITIVE: He may/might/could be working now (It is eight o’ clock)
• CAN’T / COULDN’T + CONTINUOUS INFINITIVE: He can´t be working now (It is ten o’clock)
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SPECULATIONS AND DEDUCTIONS WITH MODAL VERBS
• IN THE PAST
• MUST + PERFECT INFINITIVE: He must have had a cold (He has not come to class)
• MAY/MIGHT/COULD + PERFECT INFINITIVE: He may/might/could have been ill (He has not come to class)
• CAN’T / COULDN’T + PERFECT INFINITIVE: He can´t have been ill (He looks really healthy)