should/must have completed

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joham

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He _____ have completed his work; otherwise he wouldn't be enjoying himself by the seaside.
The answer is 'must'. I was wondering if we could also use 'should'.
Might I ask native English teachers to help me? Thank you very much.
 

Tdol

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'Must' makes better sense to me because it is an assumption based on the current situation.
 

riverkid

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He _____ have completed his work; otherwise he wouldn't be enjoying himself by the seaside.
The answer is 'must'. I was wondering if we could also use 'should'.
Might I ask native English teachers to help me? Thank you very much.

Here, 'should' feels like it only has a deontic/social modal meaning, as in,

He should have completed his work; he shouldn't be enjoying himself by the seaside when there's still so much to be done.
 
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