1) Be going to is a common structure for talking about future plans, intentions, and predictions in English. It is used to talk about definite arrangements or general future plans. 2) The basic structure is subject + be going to + base form of the verb + complement. For example, "I am going to eat dinner." Negatives replace "be" with "be not" and questions add question words or changing "be" to "be." 3) An example is provided of filling in blanks with the correct forms of be going to to complete sentences about future plans.