When writing letters and e-mails in business English, it's really important to avoid mistakes - which can make your writing look unprofessional. Today you'll learn about 10 common mistakes in business English writing. I'll explain why they are wrong and how to correct them. If you want to learn the phrases that native English speakers use for business English letters, e-mails, interviews, meetings, presentations, negotiations, and more – check out my Business English Course! The 40 lessons inside will teach you hundreds of vocabulary words and useful phrases to help you speak and write in English more confidently at work.