Where there more than two preposition phrases the phrase “that helps students” modifies “the research paper written by the teacher’ at the same time by adding commas it can modify the whole thing. “There is a book, with the research paper written by the teacher that helps students do homework.” To modify only one of them it is necessary to change the arrangement and add commas to the sentence, “there is a book that helps students do homework, with the research paper written by, the teacher.” On the other hand the passive form can modify the sentence to be it has modified the research paper. Example; there is an interesting book, at the bookshop being opened by the church.

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The gerund is modifying the both the book and the research paper. In order to modify the teacher or research paper written by the teacher we can add commas and rearrange the sentence. “There is a book, with the research paper written by the teacher, helping students do homework.” The passive form modifies the research paper. In order to have it modify the book, we can have “there is a book written by the teacher with a research paper that helps students do homework.” Example: this is the assignment given by the teacher that is making students study at the library.

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