Detailed grammar sections, such as the Grammar Reference and extra practice units, ensure students understand rules through usage.
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Language learning relies on trial and error. If you complete a grammar exercise on the Present Perfect tense and misunderstand the core concept, practicing it ten times incorrectly will only cement the wrong rule in your mind. The key allows you to check your work immediately. If you got it wrong, you stop, analyze why , and correct the misconception before it becomes a habit. traveller plus pre intermediate workbook key