By saying the structure of the Present Continuous, and the students see the table that describes the Present Continuous sentences, in the form of questions and answers. In practice, 3a)
The structure of the Present Continuous and told the students see table describes the Present Continuous in sentences, questions and answers in the exercise 3a).
By telling the structure of Present Continuous and give the students a table describing the Present Continuous in the form of interrogative sentences and answer. In the exercises 3a).