Start with one syllable words that contain a short vowel sound.
Ex. hug Spell out the word. Have the child sound it out. After sounding it out ask the child to tell you what it means. Change the last letter “g” to an “m”. Now ask the child to sound it out and again ask him/her what it means. If s/he doesn’t know, explain to them the word.
Put one word above the other and point out the single letter difference. Again review the meaning. Then use one word in a sentence.
Ex. I will give my mom a hug. Then substitute the word for the newly changed word. I will give my mom a hum. Use hand motions or movement to act out the sentences whenever possible. This will be both fun and memorable.
Repeat the exercise but this time change the first letter in hug to an “m”. So now the word is mug. The new sentence can be:
My dad gives me a hug before I go to bed. The replacement of the word mug will change the sentence: My dad gives me a mug before I go to bed.