"This is she" is short for "This is she who is speaking", and so I believe it is more formal. "This is her" probably isn't technically correct, …
1. In classical grammar, it is the subject and she the subject predicate, which is in the same (nominative) case as the subject. …
For starters, let’s break down the sentence “This is she/her.”. “This” is clearly our subject. That is not too hard to identify. “Is” is our verb in …
“This is she” was grammatically correct because the verb “to be” is a linking verb, which makes the subject pronouns “this” and …
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