On Mary’s desk a book and two pens.

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Mary‘s mother’s Mary‘s mother Mother’s of Mary Mary mother‘s

Tom's and John's；Mary and Jane's Tom and John's：Mary's and Jane's Tom's and John's；Mary's and Jane's Tom and John's；Mary and Jane's

Mary’s mother’s Mary’s mother Mary mother’s mother’s of Mary

Mary's sister Mary sister's Mary's sister's sister of Mary's

Mary mother’s Mary mother Mary’s mother’s Mary’s mother’s

put puts does did

Ann and Mary’s Ann’s and Mary’s Ann’s and Mary Ann and Mary

Mary’s mother’s 　 Mary’s mother 　 Mary mother’s 　 mother’s of Mary

Mary and Mike's Mary's and Mike's Mary's and Mike Mary and Mike

Mary’s mother Mary’s mothers’ Mary mother’s Mary’s mother’s

seated wrote sitting, written seating writing seated writing

seating; writing seated; wrote sitting; wrote seated; writing

Mary’s mother’s mother of Mary’s Mary mother’s mother’s of Mary

James and Mary's father James's and Mary's father Jame's and Mary's father James' and Mary's father

Mary’s mother Mary’s mothers’ Mary mother’s Mary’s mother’s

Mary and Mike's Mary's and Mike's Mary's and Mike Mary and Mike