Grammatical competence is the ability
1. to recognize and produce the distinctive grammatical structures of a language and to use them effectively in communication.
2. to use the forms of the language (sounds, words, and sentence structure).
Discussion
Grammatical competence as defined by Noam Chomsky would include phonological competence. Grammatical competence is the primary focus of study in most academic language courses. Most scholars agree that there is some kind of fundamental difference between being able to use the forms of the language and being able to talk about the forms of the language: the relationship between those two kinds of knowledge is a controversial topic!
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You need to have both of these in order to be successful. You can practice grammar by writing out essays. With communicative you can practice giving speeches.
The concept is very simple really. Linguistic competence is what you actually know about a language, and linguistic performance is how you actually use it. So if you make grammatical mistakes, but you know they are mistakes, then your performance does not match your competence. But if you don't know they are mistakes, then your competence matches your performance, and you are probably not native.For example, in looking at the unanswered wiki questions close to this one:How does pneumonia fit into Maslow theory?If the questioner just made a type and knows that a native English speaker would say:How does pneumonia fit into Maslow's theorythen his or her performance does not reflect his/her competence. If the questioner doesn't know that this is a grammatical error, then they lack linguistic competence in English.
lacking in ability or competence
He demonstrated his competence with his sure actions. They questioned his competence in dealing with the demonstrators.
defination of grammatical weight
Perceived competence is how a person sees another when it comes to competence. What one sees as competence may not be an accurate view.
If you make any grammatical errors in your report, you will have to redo it.Word processing makes fixing grammatical errors much easier.
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You have demonstrated your competence by the thoroughness of your report.
It is with linguistic competence that I am able to string together two sentences. Similarly, it is with technological competence that I am able to post them on the internet. To question the competence of my ability to use the word "competence"' in two sentences only highlights my incompetence at building your confidence in me. The status of my competence relies on building your confidence in my abilities, immediately, if not sooner.
Competence is what you are able to do. Performance is what you actually do.