Students are asked to write a thank-you letter using the provided activity pages that include the salutation "Dear Giving Tree," (with a comma) and the closing "Sincerely," (with a comma). Option 1 gives a structured template with the introductory greeting and closing already present; Option 2 provides the salutation and closing lines while students compose all sentences between them. Students are explicitly prompted to pretend they are the character and write a letter, which requires using the provided greeting and closing.

Students are asked to write a letter to an alien in Activity 4, using one of two "My Planet" sheets that provide a letter format. The Option 2 page explicitly shows a greeting that begins with "Dear Alien Friend" and a closing that ends with "Your Earthling Friend." The Option 1 sheet offers a structured, fill-in-the-blank letter format addressed to an "Alien Friend."

Students are asked to write a letter to a child from another country and are given an example of how to begin and end a letter: "Dear ___________/ Your Friend, ____________." The closing example explicitly includes a comma after "Your Friend," showing comma use in a letter closing. Students are prompted to compose the letter on stationery and to practice beginning and ending the letter.

The Goodbye Note activity page provides a letter template that begins with "Dear Nellie and Lawrence," (including a comma) and ends with the closing "Love, Edward." Students are asked to write (or dictate) a farewell note using that template, so they will produce a greeting and a closing in the provided format. The template explicitly shows the comma placement in both the greeting and the closing.