Detailed keys for various units—covering topics like past tenses, future perfect, and conditionals—can often be found on community-sharing sites like Digital Samples: Some platforms like
– Go to the website of the publisher (e.g., expresspublishing.co.uk, pearson.com). Look for a “Teacher’s Resources” or “Companion” section. Some publishers require a verified teacher account to download answer keys. grammar plus b2 answer key