So teacher I finished this week's grammar exam, I think is pretty hard, I know those grammar we already learned. But sometime I forget a little bit. For example, they want you to click on the sentence that uses commas correctly. In the correct sentence, all commas that appear are necessary.  Like : The temperature was 104 degrees, and Eric's car was not equipped with air conditioning. and The temperature was 104 degrees and Eric's car was not equipped with air conditioning. So which one would you choose? Sometime you just forgot which symbol you should put at.