Yes, it's correct, but it's old-fashioned, and rather stiff and formal. The ordinary modern colloquial form is "This is her."
This sentence is not grammatically correct. For the sentence to be grammatically correct, the space between "in" and "to" would have to be removed. Therefore the sentence should read "They are into skating."
"That was wrong" is a grammatically correct sentence.
Saying, "I am annoyed of the way you behave.", is grammatically correct.
Yes, that sentence would be grammatically correct.
The correct phrasing is "my partner and I." Using "my partner and me" in a sentence as the subject would be grammatically incorrect.
Short answer : Yes and not impolite at all, as suggested below. This is to be handled by you grammatically correct? requires inverted commas to be correct. It should be written as: "Is this sentence "This is to be handled by you." grammatically correct?" The sentence is correct but not very polite; it would be simpler to say "You are to handle this"
The sentence is grammatically correct.
The sentence "Rhoda's Crazy" is not grammatically correct. It is missing a verb to make a complete sentence.
You had not taken that into account. Would be the grammatically correct version of that sentence.
Yes, but it would not be grammatically correct.
"I said to him" is a grammatically correct sentence fragment since "said" is still waiting for its direct object. You said what to him? "I said "to him". would be a grammatically correct sentence.
Yes, I would say that sentence would be grammatically correct.