She must be very healthy

[Uleanu Viorel]

Test No. incompl/elem-28 "Responses", question 3

Mike: 'She always goes to work on a bike.'
Jane: '.........'

(a) She is very healthy.
(b) She must be very healthy.
(c) She can be very healthy.
(d) She might be very healthy.

Test No. incompl/elem-28 "Responses", answer 3

Mike: 'She always goes to work on a bike.'
Jane: 'She must be very healthy.'

Correct answer: (b) She must be very healthy.

Your answer was: incorrect
Mike: 'She always goes to work on a bike.'
Jane: 'She might be very healthy.'
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Why is correct "She must be very healthy" and not "She might be very healthy"?

[Alan]

The speaker is saying it as a fact - she must be very healthy - there is no doubt about it. She might be very healthy would mean there is some doubt about it.
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