Post the poster on a reading or writing bulletin board. Students will have reminders of what to do when adding or changing from a singular noun to a plural noun.
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When introducing or teaching the rules of plurals, start with one of the rules and teach only one at a time. Then practice this skill by providing games or worksheets. You can also have students search the story they are reading for plural nouns. See if they can find the rule that matches the plural they found in their story. This poster will come in handy when doing so.