Write the next sentence in the following story.

How to classify fractions
Point out a proper fraction.
In any proper fraction, the numerator is less than the denominator.
Example : 2/5 every proper fraction expresses a value that is less than 1.

(I). Example : 3/6 next fifth to the numerator. Call genres a fraction, not a denominator.;
(II). Example : 3/10 every improper fraction expresses a value that is too high. Example : 4/20 every improper fraction expresses a value that is too low.;
(III). Example : 2/3 every improper fraction expresses a fraction that is too long. Example : 3/8 every improper fraction expresses a fraction that is too short.;
(IV). A proper fraction represents a partial portion of a whole. For example, if there are five books and you read two of them, you have read two out of five books, or two-fifths.;. The answer should be
(IV).