Quine's arguments in 'Reference and Modality' show that context-sensitive predication of modal properties invites referential opacity, undermining the compositionality the nonstandard semantics was meant to preserve.
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A problem in logic where the meaning of a phrase can be unclear or 'opaque' depending on how we interpret it. For example, 'the morning star' and 'the evening star' refer to the same planet (Venus), but they don't mean exactly the same thing.
compositionality(Philosophy of language; the passage treats idioms as candidate counterexamples because their meanings appear not to be so constructed)
The property of natural language whereby the meaning of a complex expression is built from the meanings of its constituting parts
modal properties(Discussion of what entities bear modal properties in the context of the modal argument)
Properties such as being necessarily true, contingently true, necessarily false, or contingently false, and being true or false at a possible world.