I tutored English for over ten years, and many students mistakenly interchanged the words "few" and "several." A good rule to abide by when using several is to use it when you are talking about three or more things. For example, if someone asks you how many days are remaining until the game. You can say "a few" if there are two days remaining. If there are three or more days remaining, the correct response will be to say that there are several days left. Several indicates a greater quantity than a few.