I have a stereo in my house.'
Teachers are auuthority us 

                        ======CORRECTED SENTENCE======
Alice:Teachers are auuthority us
Corrected Sentence:Teachers are example of our authority.

>> You still lack the correct predicate for the sentence. And always put a punctuation mark after every sentence.

                                ======COMMENTS======

Alice, you answered the first sentence correctly. But your second sentence lacks a predicate and a punctuation mark. Next time please try to answer in a complete sentence. Take care!

-Teacher Iza