Motivate students to learn a new grammatical construction by showing how it can be used in real-life situations. Design a brief activity or event at the beginning of the lesson to engage their attention and focus their thoughts on the learning objective. One way to do this is to create situations that require students to use and practice the new grammatical form. For instance, pair students up and ask students to ask each other about their plans for the following day so that they can use the future "going to" form.
Review familiar grammar structures that students have already learned so that they can build new learning on a firm foundation. When you remind students about what they already know, it gives them confidence to tackle new material. It's a good idea to avoid introducing more than one new grammatical construction per day to ESL students.
Use today's new grammatical structure in a brief sentence in which all the other words are familiar to the students. It often speeds comprehension if you can give them the comparative construction in their own language. For instance, the form "I had been" in English, corresponds to the form "habia estado" in Spanish. Speak the model sentence several times while pointing to it on the board and then ask students to repeat it. Then write additional sentences that use the same grammatical construction on the board. Underline the new structure, and again ask students to repeat the sentences out loud. You can use arrows or diagrams to show the relationship that the new structure has to other words or parts of the sentence.
Hand out a paragraph that contains several examples of the new grammatical construction and ask students to underline the form where they find it. On the same sheet of paper ask them to write three or four sentences using an example of the new structure. When they are finished, ask a few students to write one sentence each on the board. Then ask other students to come up and declare that the sentence is correct, or make needed changes.
For closure, check to see if students have any questions about the new material. Ask them to explain how the new grammar item will help them communicate in their daily life. Then give students a brief quiz or homework assignment that requires them to respond to a question regarding a situation, process or problem using the new grammatical form. This written work will give you a chance to see how well the students have absorbed the lesson.