Some guidance please on explanation of tarqeeq and tafkheem to grade 2 students

Question
asalam alaikum
Some guidance please on explanation of tarqeeq and tafkheem to grade 2 students
Answer
Wa alaikum assalaam wa rahmatullahi wa barakaatuh
For children of this young age there should be practical points and not an technical terms.  The sound of tafkheem can be isolated  without any letter and you demonstrate the sound and have them practice.  You could make a game out of it and have contests, etc.  Once they understand how to produce the sound, then you can teach them the letters to which this applies.
May Allah make it easy for you.