Ending the lesson (concluding, learners’ reflection, fillers) Who among esl teachers does not understand the purpose behind a warm up activity?

Performance correction and feedback
Right before the last 5 minutes of class you can have some sort of performance activity, for instance a role play. Usually we don’t correct students during the role play so we don’t interrupt the flow, but when they’re done you can end the class with corrections of words or expressions they used incorrectly; things they forgot to say, etc…and your students will go home with these corrections fresh on their minds. Students may also give their opinion or feedback on their classmates’ performance.
60 seconds
Choose a few students and give each 60 seconds to speak about something you’ve covered that day: what they did yesterday if you worked on simple past; talk about Halloween, professions, or animals; older learners may even give a “how to” lesson; they may also summarize a story they heard, or place themselves in another person’s shoes, like a celebrity, profession, or even animal. But they must speak for a full minute. To motivate students to speak, you may choose to reward the student who says the most, or includes the most information, with a reward sticker.
Write an email
Ask students to imagine they have to write an email to a friend or family member and tell them what they did today in their ESL class. Students have a chance to summarize what they’ve learned in written form. This writing activity may be tailored to any topic. If you talked about farm animals, ask students to write about their favorite animal and why it’s their favorite. And the same goes for foods, sports, celebrities. Adult learners may write a business email with the new vocabulary they’ve learned.
Say goodbye
For very young ESL learners the best way to wrap up a lesson is with a goodbye song or saying goodbye to a puppet. The puppet may “ask” them questions about something they learned, and even give them a short “review” by asking, “What’s this?” or “What’s that?” or any other question or expression they may have learned. You may set aside this special time with the puppet every day at the end of the class, so children know what to expect, and even though they may be very young, they will still have this sense of closure.