Second day on the same lesson — p.5, word building, one sound swapped at a time. Do not re-teach it. Re-run the column and go at whatever the children were not accurate on yesterday.
Push your lips out into a tight little circle, like blowing out a candle, then open them into the next sound — w.
They check it: Mirror: lips round and forward. If your teeth touch your lip you are saying /v/ instead.
Not in Urdu. For those children this is a new physical skill, not a reminder. Do not let the column start until the mouth can make it.