I'm a BA student of English and American Studies, this semester I've chosen linguistics and I can't recommend this book by George Yule enough. I bought it right at the beginning of the semester and it really helps you to understand everything because it explains all the important words and phenomena you'll be dealing with in your courses in an EASY TO UNDERSTAND language. That is so important! I gives lots of examples and at the end of each topic, there are questions and tasks for you to get deeper into the subject. I wouldn't have understood many things without this book and I'm so glad I decided to buy it.