If you take the exact words of an author, and change a number of words in the sentence, you are slightly rephrasing the words of another. These small changes are not enough however to make it your own sentence. So, while you do not need to include the words in quotation marks, you still must cite the source from which you obtained the information.
Example
Source: L P.J. Casey, K.T. Cullen & J.P. Duignan, Irish Doctors in the First World War. Kildare: Merrion Press, 2015, p. 101.
“From October 1914 to February 1919 forty-six hospital ships arrived in Dublin carrying 19,255 wounded soldiers who were allocated to various hospitals in Dublin, Cork, Belfast, the Curragh and other places throughout the country.”
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Student writing sample: Between October 1914 and February 1916 there were forty-ships hospital ships which arrived in Dublin. These ships carried nearly 20,000 wounded soldiers who were, in turn, dispatched to hospitals in major cities such as Dublin, Cork, Belfast, as well as other places throughout the country.
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Is this plagiarism? Yes, while there has been some attempt to paraphrase from the original text, there is no acknowledgement of the original author. The passage is therefore using information and ideas from Casey, Cullen & Duignan but, since this has not been documented, it is plagiarism.