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It is, though in some situations it might be considered a bit blunt. If you're talking to someone on the phone, "May I ask with whom I am speaking?" would be a more formal phrase to use. However, if you're pointing at someone in, say, a photograph, "who is this?" is an entirely reasonable question to ask.
What else can I help you with?
is How is you correct sentence?
"How are you" is a correct sentence.
Is this sentence correct?
Yes, this sentence is correct.
You are palpitating is this sentence correct?
You are palpitating. This is a correct sentence.
Is this sentence correct - your retina is healthy?
With the exception of not capitalizing the 'y' at the start of the sentence, it is a correct sentence.
Is the sentence 'There you are' correct or incorrect grammar?
That sentence is grammatically correct.
Ram are a good boy .is it a correct sentence?
no it is not a correct sentence.
Does the sentence you do do that have correct grammar?
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'.
Is you and him correct in a 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."
Is the sentence The frogs were in the water correct?
Yes, the sentence is correct grammatically. The sentence is The frogs were in the water.
Had never been experience-is this a correct sentence?
No - the sentence 'Had never been experience' is not a correct sentence.
You stand at zero hour is that a correct sentence?
This sentence is grammatically correct.
Correct the sentence fluidity of love?
This is not a sentence it is a phrase and as a phrase it is correct.
