Here you have two sets of worksheets helping students practice with direct object pronouns. Both include answers for your use.
The first is very basic. It begins by spending a page and a half getting students through the re-writing of 6 sentences going step by step (identify the verb, identify what or who the verb happens to, find your pronoun, place it before the verb). Then, it gives students 6 more sentences to practice with own.
The second activity is advanced. It's a two page story about a girl who wants a car for her birthday. Students must complete the blanks with the correct direct object pronouns. Because this task is harder, it also comes with a powerpoint that shows the answers, as well as a line by line translation so students can check that they understood what was going on in the story.
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You can also get a bundle containing presentations and handouts for direct object pronouns, indirect object pronouns, and reflexive verbs. You'll save approximately 25% buying them bundled as compared to individually. Click here for more info.