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Here we have an example on how people sometimes use the language and how it should be use.

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I think this is a good example of prescriptive grammar, because it specifies how a language and its grammar rules should be used

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I think this SPEAKING section is descriptive as there is a brief explanation of how a photo or painting can be described.

Quevedo Páez Luisiana

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It's prescriptive because it only has a correct option to choice for each points.

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Here, the first two activities are examples of descriptive grammar and the last two are of prescriptive grammar.

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taken from "Anglia Exam Preparation" Workbook

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This is an example of descriptive grammar due to the nature of the explanations of how to structure different types of letters.

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I think that exercise D, it's the perfect example of a descriptive grammar, because It doesn't stick to a correct or incorrect answer, it just based on which answer is apropiate by the context.
The book is Close-up second edition.

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I think this could be seen as prescriptive because it only focus on explaining how future forms should be used