Grammar is viewed as one of the language skill that should be acquired. It is the skeleton of the language. Dictionaries  define grammar as the rules and explanations which deal with the forms and structure of words (morphology), their arrangement in phrases and sentences (syntax), and their classification based on their function (parts of speech). Therefore, the second semester sequence is about tenses and aspects in which the ELS are going to learn the most common tenses and master their use, sch as the present, the present continuous, the past simple, the past continuous...