What Is the Nominative Case?
The nominative case is the case used for a noun or pronoun which is the subject of a verb
Explain Mark eats cakes.
The noun Mark is the subject of the verb eats. Mark is in the nominative case.
Explain He eats cakes.
The pronoun He is the subject of the verb eats. He is in the nominative case
Explain They eat cakes
The pronoun They is the subject of the verb eats. They is in the nominative case.