But that isn't a sentence, it is a sentence fragment. Let's say you want to use that fragment in a sentence. You might say something like, My neighbor is a thin, frail, elderly-appearing 65-year-old lady. As an editor I would also point out that if you have already noted that this woman is thin and frail and 65 years old, it is really superfluous to also state that her appearance is elderly. I would omit that phrase.
"How are you" is a correct sentence.
Yes, this sentence is correct.
The correct spelling of the canine-appearing mammal is "hyena".
You are palpitating. This is a correct sentence.
no it is not a correct sentence.
That sentence is grammatically correct.
Yes, that is a correct sentence.
no_____If the sentence is You do do that (meaning You are in the habit of doing that) the grammar is perfectly correct and the sentence 'does have correct grammar'.
With the exception of not capitalizing the 'y' at the start of the sentence, it is a correct sentence.
"You and him" is correct in a sentence such as, "I sent the tickets to you and him," versus a sentence such as, "You and he should send the tickets to me."
No - the sentence 'Had never been experience' is not a correct sentence.
Yes, the sentence is correct grammatically. The sentence is The frogs were in the water.