There’s a easy and free way, just go to docs.google.com, click the upload button to upload your pdf file. Remember to check the option "Convert text from PDF or image files to Google Docs documents " before you click the “start upload” button. After the upload is done you can find the converted file on your Google Docs, now copy the texts to an empty word file, done! With this method you can also convert pdf to ppt if you copy the converted tsts to your empty ppt file. Or you can simply use a converter which will save you a lot of time and trouble. To find out how to convert pdf to word on mac you can also go to adobe’s website.