Using an MQXLIFF file to translate an SDLXLIFF

My translator has translated my SDLXLIFF file using MemoQ but is unable to save the target SDLXLIFF.  I can add the MQXLIFF to my TM but when I then try to 'translate' my SDLXLIFF the TM does not have the tags (the source file is XLF) and so I have to add the tags to every unit and it's a big file.  Is there a way to use the content from the MQXLIFF file to populate my SDLXLIFF?