The comparative degree of adjective and adverb are used when we compare one with the another. There are three kinds of rules of the comparative form. First, add “-er” to the almost all one-syllable adjectives, such as taller, older. Second, change the letter “y” into “i” plus “-er” to the words ending with “y”, such as quicker, earlier. Third, add the word “more” or “less” before the muti-syllable base, such as more beautiful, less important.