The sentence is
Some employee must leave.
I was told that it is actually ambiguous and has two meanings. But I can only see one. What are the two meanings?
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The two senses are specific and non-specific:
Specific: A certain person, who happens to be an employee, must leave. ("Employee" is not in the scope of "must".)
Non-specific: There is a requirement that the person who leaves be an employee. ("Employee" is in the scope of "must".)
Paul Postal observed that the vowel of "some" can be reduced to schwa only in the specific sense, in such examples.