I see this problem in a lot of more experienced English learners: Their written English might be 90% fine, but there are still some small errors. These mistakes don't affect communication... but of course we still want to correct them! In today's lesson, I'll teach you 8 common English grammar mistakes with examples from real students of mine. Are you an upper-intermediate or advanced student, and do you want to make sure your written English is completely correct? If so, then you would definitely benefit from my Advanced English Grammar Course. It has 45 lessons that cover many aspects of English grammar in depth, with plenty of examples. But what really makes it special is the writing task in each lesson, where you have the opportunity to send me your writing for correction and feedback. You can click here to learn more about the course, see the lesson list, and take some free samples.