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The lesson did an excellent job of explaining the differences between the future tenses and the situations in which \"going to\" is used in the future tense. I also feel that the lesson went really in depth when it explained when to use present tenses in the future tense. It's very difficult to differentiate sometimes between all these future tenses and this lesson does an excellent job of simplifying it.In unit 18 there is a basic information about modals, phrasal verbs and passive voice. A group of words containing a subject and a verb is called relative clause. AA relative clause has 3 categories and two types. Grammar material presented in this unit presents a lot of difficulties for a teacher or students, that's why there is a variety of teaching ideas and suggestions about this subject in this unit.