Hello there! I'm afraid I have to inform you that "Hi!" is not the singular of moose. "Hi" is actually a friendly greeting similar to "hello". As for the singular form of moose, it is simply "moose".
English can be a tricky language, with many words that have unusual plural forms or no plural form at all. "Moose" is one such word. Even though it ends with the letter "s," it is both singular and plural. You can have one moose or many moose, but you would never say "one moose" or "many meese" like you would with some other animals.
I hope this explanation has been helpful to you. If you have any other language-related questions, feel free to ask!
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