Análisis de la app English Grammar in Use para 23 de septiembre

Students who want help with English grammar. It is written for you to use without a teacher. Will be useful for you if you are not sure of the answers to questions like these: - What is the difference between I did and I have done? - When do we use will for the future? - What is the structure after I wish? - When do we say used to do and when do we say used to doing? - When do we use the? What is the difference between like and as? These and many other points of English grammar are explained and there are exercises on each point.