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who is: Who’s going with you?
Not to be confused with:
whose – possessive case of which or who: Whose comb is this?
Abused, Confused, & Misused Words by Mary Embree Copyright © 2007, 2013 by Mary Embree
1. Contraction of who is.
2. Contraction of who has.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
short for who is, who has.
Kernerman English Multilingual Dictionary © 2006-2013 K Dictionaries Ltd.