If, for example, you have taught the appositive writing tool and students have had practices in which they unscrambled, combined, or imitated professional sentences illustrating effective appositives, then they are ready for an expanding activity.
Step One: Choose a professional sentence model containing a sentence composing tool you'd like your students to learn and practice.
Model Sentence with Appositive
The gardener, the last one of Gatsby's former servants, came to the foot of the steps.
--F. Scott Fitzgerald, The Great Gatsby
Step Two: Present Fitzgerald's sentence without the underlined appositive.
Model Sentence without Appositive
The gardener, ^, came to the foot of the steps.
--F. Scott Fitzgerald, The Great Gatsby
Step Three: Have students insert an appositive at the caret mark, with content compatible with the context and writing quality of the model sentence.
Variation: