Answer:
Context clues are supporting sentences for providing information on the meaning of difficult words. Therefore, when we just have a little vocabulary mastery, of course will be directly proportional to the mastery of context clues. For example, when there is a sentence and we do not even understand the meaning of it. We do not know the meaning of each word or we know a little word only, the uses of context clues can be an advantage.
This approach will not be running, as it should. To overcome this problem at least should first increase our vocabulary mastery. By mastering vocabulary well, is expected there will creativity enhancement in word processing, especially relation to the ability to read. In reading, one must have an adequate vocabulary so that he can figure out the meaning of reading's content. Context clues are a combination of reading skills, vocabulary mastery, and creativity. Three of those should go together
Context clues also help in case of polysemeous words. For example the verb "to get" can mean "procure" (I'll get the drinks), "become" (she got scared), "have" (I've got three dollars), "understand" (I get it) etc. Here the role of context clues in determining the meaning of the polysemeous word. A context clue is an approach to infer the meaning of unfamiliar word, which is based on the sentence context. That words mean exactly can be figured out or at least very close to the real meaning.
There are some of disadvantages of context clues, among of them: For beginner reader, it needs more time, The context clue sometime does not sufficient and leads the reader in misguessing, Depend from our background knowledge