The rule is that you use the nominative case for subjects and nominative complements: I am who I am. And you use the objective case for objects of all sorts, direct and others: You hit me! Give me that bat.
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And you use the objective case for objects of all sorts, direct and others:I am who I am.
But most people simply don't follow the rule for "It'You hit me! Give me that bat. I don't want you swinging at me again.
In your examples "You and I" forms a compound subject. "Playingnoun: He is Michael Jackson.
adjective: He seems bad.