Question

you have to / must be very tired after your long walk.
underline the correct words
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Answer 1

Answer:

Must be

Explanation:

you must be tired after your long walk

Answer 2

Answer:

Must is the correct answer

Explanation:

That's because have to is used to show obligation which is not possible here.

Must is used to show personal opinions which is expressed here.

Thus, Must is the correct answer