Definition of Case:
The grammatical association of nouns and pronouns to other words in a sentence is defined as the case.

Examples of Case in Sentences:
- Jack is going to the varsity.
- He is going to the varsity.
- He is a doctor.
- This is Jim’s book.
- This is his book.
- I helped Ann.
- I helped her.
- Rock, are you coming to the concert?
- You, come here.
- Lisa is completing the project.
- Suzan will perform in the program.
- The teacher teaches Paul.
- The doctor is examining the patient.
- The police will solve this case.
- Peter, are you going home?
- Samantha will not come.
- She is a lawyer.
- Pam is writing a letter.
- Richard is singing a song.
- Sam will come tomorrow.
Types of Case:
In English, there are mainly four types of cases:
1. The Subjective Case or Nominative Case
2. The Possessive Case or Genitive Case
3. The Objective Case or Accusative Case or Dative Case
4. The Vocative Case