Answering questions is a good example of how while-listening and post-listening is combined.
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Listening for the gist and setting the scene for the students before listening are the very common types of pre-listening activity.
There are many opportunities to integrate listening with the practice of other language skills, especially at the while-listening stage. Tasks like role-play, discussion, debate, writing, etc, can be used in this stage.
In post-listening, teachers test how well the students have understood what they listened to. Further, the teacher might provide activities for students to practice oral or written work.
In while-listening stage, students need to pay attention and process the information actively, and the teachers need to prepare various tasks or activities for students to do to train their listening ability.