You are asked to write an essay in third person narration, what does this mean?
Writing in third person is from the third person point of view meaning the narrator is not directly involved in the story. Third person uses pronouns such as he, she, it, or they.
Write the chemical formula for table salt.
NaCl. Table salt is made up of sodium and chloride.
Matthew a very good friend of mine happens to be in my class. What punctuation should be added to this sentence to make it grammatically correct?
The sentence should read: "Matthew, a very good friend of mine, happens to be in my class." "..a very good friend of mine" is an appositive phrase and should be separated from the rest of the sentence by commas. When you are speaking out loud you would take natural pauses when making this statement. The first pause is after the word "Matthew", and the second is after the word "mine". Another way to determine where to put the commas is to read the sentence without the appositive phrase. Without the phrase "a very good friend of mine" the sentence still makes sense. The phrase is unnecessary to the sentence and should thus be separated by commas.