Who've is defined as who have.
An example of who've is someone asking a friend about the person they have been dating recently.
Only used when have is used as a modal verb.
who +"Ž -'ve
- This travesty of democracy has shaken the loyalty of people who've been in the party for a long time.
- While many people can easily name at least a handful of famous female "supermodels," they may have to think before naming some of the guys who've earned fame walking the runway or modeling a famous designer's briefs.
- Young men who've never worn school uniforms likely won't find themselves in the position of tying a tie until they're quite a bit older - those clip-on ties sure come in handy when you're a child!
- After meeting another famous psychic, Lydia Car, who told John that his purpose was to teach people through his psychic abilities, he started to explore becoming a professional medium in order to help people who've lost loved ones.
- Though women who've recently given birth clamor to tone these muscles, men too will appreciate how tightening and strengthening their lower core will improve their entire strength and look of their abdominals.