If you are reading this, you have likely searched for this PDF online. Let’s address the elephant in the room: (formerly VKontakte) is a massive social network, but for ESL teachers, it functions as the world's largest digital library.
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The Teacher's Book includes a "Common Errors" box at the bottom of each page. For B1, common errors include:
At B1, according to the CEFR (Common European Framework of Reference for Languages), learners can: