 Relating knowledge with competence was significant enough to represent that the competence of the speaker is judged by means of errors that concern the amount of linguistic data he or she has been exposed to, however, performance which is the actual use of language does not represent the language knowledge that the speaker has.According to J. Richard et al (2002), people may have the competence to produce an infinitely long sentence but when they actually attempt to use this knowledge (to “perform”) there are many reasons why they restrict the number of adjectives, adverbs, and clauses in any one sentence (2002, 392).The actual state of the speaker somehow involves and influences the speaker's performance by either causing a good performance or mistakes.