What are the common pronoun case errors in sentences to avoid?

The common pronoun case errors in sentences to avoid are:

1. Using the subjective case pronoun (I, he, she, we, they) instead of the objective case pronoun (me, him, her, us, them) when the pronoun is functioning as the object of a verb or preposition. For example, "He gave it to she" should be "He gave it to her."

2. Using the objective case pronoun (me, him, her, us, them) instead of the subjective case pronoun (I, he, she, we, they) when the pronoun is functioning as the subject of a sentence or clause. For example, "Me and him went to the store" should be "He and I went to the store."

3. Using possessive pronouns (my, his, her, our, their) instead of contractions (mine, his, hers, ours, theirs) when there is no noun following the pronoun. For example, "The book is her's" should be "The book is hers."

4. Using the wrong pronoun case in comparisons. For example, "She is taller than him" should be "She is taller than he (is)."

5. Using the wrong pronoun case in compound subjects or objects. For example, "Me and him are going to the party" should be "He and I are going to the party."