I begin the lesson by explaining to my students that today we will examine the contractions "don't" and "doesn't." Both use forms of the word "do." Doesn't is a contraction for "does not." We should use "doesn't" with a singular subject and with the pronouns he, she, and it. Don't is the contraction for "do not." Use "don't" with a plural subject and with the pronouns I, you, we, and they. We should use the grammar rules when writing, as well as when speaking. I write an example of sentences using "don't" and "doesn't" properly on the board.
Thunderstorms don't scare me. Rain also doesn't scare me.
Then, I ask my students to write one sentence using "don't" correctly and one sentence using "doesn't" correctly. I allow some students to share what they wrote. Most use the words correctly, but some do not. I tell the ones that do not use the words correctly that this lesson will help them to learn how to use "don't" and "doesn't" correctly.
I use the attached Powerpoint presentation to model the correct use of "don't" and "doesn't" and provide guided and independent practice for my students. I do slides 2-4. We do slides 5-7. They do slides 8-11.
For this portion of the lesson, I have students to work with a partner. Each partner writes a singular noun on an index card and places it face down on their desk. One partner, then, uses descriptive sentences using the word "doesn't" to describe the noun. The other partner tries to guess what the noun is that is written on his/her partner's index card. Then, they change roles and repeat the process. After both partners have had an opportunity to describe and guess a singular noun. Then, they both write plural nouns on the other side of the index card, place it face down, and repeat the guessing process.
To close the lesson, I have students to continue working with their partners. One partner uses "don't" in a sentence. The other partner evaluates whether the sentence is grammatically correct and tells why or why not. They, then, repeat the process for the word "doesn't." Afterwards, they switch roles and repeat the process.