Minimum level suggested: PRE-INTERMEDIATE
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What a confusion!!! Have you ever know the difference??? QUIZ + EXPLANATION to clarify all doubts!
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English Grammar in USE – intermediate
Libro di testo + ebook
This book with answers has clear explanations and practice exercises that have helped millions of people around the world improve their English. It is perfect for self-study and can also be used by teachers as a supplementary book in classrooms.