Depending on what perspective you use to tell a story, you will need to use a specific set of pronouns. This can be confusing, especially for younger students. In the third-person omniscient, students should be using "he," "she," "it" and "they" as pronoun subjects, and "him," "her," "it" and "them" as objects. Give students a quick scenario with a sentence without pronouns such as, "Sheila walks down street wearing [ ] hat." Have students rewrite it with pronouns: "She walks down the street wearing her hat." Repeat this exercise using a number of different examples.
One of the best ways to learn to write from a specific point of view is to rewrite a story told from a different perspective. Find a story told in the first person. Ideally, you should find one that involves the narrator's subjective feelings. Have students read it and rewrite it in a third-person omniscient voice. Encourage students to focus on the external facts and descriptions of the setting. If the first-person narrator has omitted these, allow your students to make these up.
Another way to have students practice the third-person omniscient is to have them narrate a picture. Bring to class a series of pictures cut out from magazines. Try to find a variety of different scenes. Ask students to choose one and tell the story of what is happening from a third-person omniscient point of view. Make sure they use the proper pronouns and speak with knowledge beyond what individual characters might have.
One of the most difficult challenges of writing in the third person is representing the thoughts of other characters. Have students write a dialogue between two characters in conflict. It can be any kind of conflict. Have students represent the speech of each character, but also the thoughts of each. Make sure they use the proper pronouns. The real challenge of this activity is making neither character obviously more sympathetic than the other. Tell students that the best stories will have two characters that the reader can both sympathize with.