Context-free grammars, by definition, cannot represent context in language. A classical example of context-sensitivity in English is “the first letter of a sentence must be capitalized.” A context-sensitive grammar8 for this property of English sentences is:
In a context-sensitive grammar, the left-hand side of a production rule is not limited to one non-terminal, as is the case in context-free grammars. In this example, the production rule only applies in the context of <start> to the left ...
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only applies in the context of <start> to the left ...