I don't find this kind of lesson helpful at all.
As someone who has studied multiple languages, you will find its quickly showing them and generally only the smartest will answer, and the retention will not be good.
The grammar itself for the Present Continuous (현재 진행형) isn't explained properly here either
It is not Subject + Verb (ing)
It is Subject + to be + Verb (ing)
Without the verb to be (which should also be double checked for both present and past continuous with the students) the continuous tense doesn't work
I am / was
You are / were
He /She/ It was/ were
We are/ were
They are /were
You are / were
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A better way is to ask them what they did on the weekend for the Past Continuous (과거 진행형)
Elicit sentences such as " I played football " " I watched TV"
These are simple SVO
You can then ask ...what were you doing at 7pm on Saturday ?
In Korean they add +고있다 to a verb ...which is the same as our 'ing'
If you can learn some Korean examples it will help
You should then show the grammatical structure.
Get examples from students to write on the board
A worksheet should be given to check their retention.
In a follow up lesson a good excercise is to get a bunch of Historical pictures
E.g Neil Armstrong on the Moon, Korea at the World Cup 2002, A photo of people in class or yourself. But have up to 15 or so
You then write up on the board "What is happening in the picture ?"
Or for the past continuous.... "What was happening when the picture was taken ? "
You can then guide students through their answers... Some will shout up
Moon !!! Armstrong !!!
Elicit the correct answers...
You should ask...what is the subject ? (주어) He
What is the BE verb ( BE 동사) ? is
What is he doing...what is the verb (동사) ? walking
Where is he ? ...on the moon (Object = 목적어)
You can make this into a game easily, or give candy to students who are willing to actually come up to the board and write out the full sentences with encouragement help from other students....instead of you writing and talking all day.