His coat is here, so he ___ be nearby. (strong deduction)
Your answer: Unanswered
Correct answer: must
Completed sentence: His coat is here, so he must be nearby. (strong deduction) Use must for a strong positive deduction, might/may/could for possibility, and can't for a strong negative deduction. These are judgements from evidence, not statements of obligation. Mustn't normally expresses prohibition, not the opposite of deductive must.
That ___ be Eva; she is abroad. (impossible)
Your answer: Unanswered
Correct answer: can't
Completed sentence: That can't be Eva; she is abroad. (impossible) Use must for a strong positive deduction, might/may/could for possibility, and can't for a strong negative deduction. These are judgements from evidence, not statements of obligation. Mustn't normally expresses prohibition, not the opposite of deductive must.
I'm unsure; they ___ be at lunch.
Your answer: Unanswered
Correct answer: might
Completed sentence: I'm unsure; they might be at lunch. Use must for a strong positive deduction, might/may/could for possibility, and can't for a strong negative deduction. These are judgements from evidence, not statements of obligation. Mustn't normally expresses prohibition, not the opposite of deductive must.
She ___ be tired after working all night. (strong deduction)
Your answer: Unanswered
Correct answer: must
Completed sentence: She must be tired after working all night. (strong deduction) Use must for a strong positive deduction, might/may/could for possibility, and can't for a strong negative deduction. These are judgements from evidence, not statements of obligation. Mustn't normally expresses prohibition, not the opposite of deductive must.
Which expresses an uncertain possibility?
Your answer: Unanswered
Correct answer: It could be a mistake.
Correct choice: It could be a mistake. Use must for a strong positive deduction, might/may/could for possibility, and can't for a strong negative deduction. These are judgements from evidence, not statements of obligation. Mustn't normally expresses prohibition, not the opposite of deductive must.
