Identify the gerund phrase, the subject of the verb can be.
a) flying a kite can be fun.
b) flying a kite can be fun.
c) flying a kite can be fun.
d) flying a kite can be fun.

Gerund phrase is flying.
Subject is a kite.

Syllable added to a root word to change its meaning : affixan independent word--example run,walk,book : free morphemeaffix that gives grammatical meaning such as tense or number : inflectiona word part that must attach to a word in order to be usable : bound morphemedegree of comparison formed by adding -er or more to an adjective : comparativedegree of comparison formed by adding -est or most to an adjective : superlativeaffix added to the beginning of a word : prefixaffix added to the end of a word : suffixroot word of lovable : lovetwo roots used together to form one word : combining form