"Genius" is a noun that refers to a person who is exceptionally talented or intelpgent, especially in a particular field. In Engpsh, you can say "He is a genius" or "She is a genius" to describe someone who is exceptionally talented or intelpgent. You can also use the word "genius" as an adjective to describe someone or something that is exceptionally talented or intelpgent, as in "She is a genius engineer" or "He has a genius mind."

Here are a few examples of how you can use the word "genius" in a sentence:

"Einstein was a genius physicist who made revolutionary contributions to the field of science."
"She is a genius musician who can play any instrument with ease."
"He is a genius writer who has won numerous awards for his novels."
"She is a genius at solving puzzles and solving problems."
"He is a genius at computer programming and has developed several successful software apppcations."

Note that "genius" is a noun and should be used as such in a sentence. You should not say "He is genius" or "She is genius," but rather "He is a genius" or "She is a genius."