Avoiding Common Grammar Mistakes

A Simple Way To Remember Possessive Personal Pronouns

(Sorry about the alliteration in the title.)

• Hers
  "Hers" is the possessive of the pronoun "her".
  She lost hers.
  
  Her's is not a word.
  An easy way to remember this is to think of "his's", which is not a word, either.
  
  
• She's
  "She's" is the contraction of "she is".
  She's looking for it now.
  
  
• His
  "His" is the possessive of the pronouns "he" and "him".
  It belongs to him; it's his.
  
  "His's" is not a word because "His's" would be the contraction of "his is".
  
  
• He's
  "He's" is the contraction of "he is".
  He's looking for it now.
  
  
• Its
  "Its" is the possessive of the pronoun "it".
  The dog was loose because its collar had come off.
  
  
• It's
  "It's" is the contraction of "it is".
  It's running around the neighborhood now.
  
  
• Ours
  "Ours" is the possessive of the pronouns "us" and "we".
  Ours is still at home.
  
  "Us's" is not a word because "us's" would be the contraction of "us is", just as "we's" is the contraction of "we is".
  
  
• Theirs
  "Theirs" is the possessive of the pronouns "they" and "them".
  Theirs is a different color. The red one belongs to them.
  
  "Their's" is not a word because "their's" would be the contraction of "they is".
  
  
• Whose
  "Whose" is the possessive of the pronoun "who".
  I wonder whose has stripes?
  
  
• Yours
  "Yours" is the possessive of the pronoun "you".
  This blue one is yours.
  
  "Your's" is not a word because "your's" would be the contraction of "your is" and that just doesn't make sense.