A man wearing a green shirt is playing his blue guitar and singing .
A woman wearing a grey shirt is playing her black guitar and humming .
A man wearing a green shirt is playing his blue guitar and singing.
A woman wearing a grey shirt is playing her black guitar and humming.
A woman is not a man.  Singing is not humming.  A blue guitar is not black.
A woman is not a man . Singing is not humming . A blue guitar is not black .