Learn the most important English grammar points with the Collins COBUILD Pocket English Grammar. - Simple explanations help you understand key grammar points; - Examples from the Collins Corpus show you how English is really used today; - Warning notes help you to avoid common errors; - Supplements give extra help with academic English, business English and irregular verbs.Learn the most important English grammar points with the Collins COBUILD Pocket English Grammar.  - Simple explanations help you understand key grammar points; - Examples from the Collins Corpus show you how English is really used today; - Warning notes help you to avoid common errors; - Supplements give extra help with academic English, business English and irregular verbs. For intermediate learners.