Words need to be arranged properly for them to make sense to a reader. When the student utters the sentence above, he has committed an improper usage of;
Syntax is the arrangement of words in order to make well-formed sentences.
To make sentences that have meaning, there ought to be a proper structure of words. There are rules guiding the arrangement of words.
Usually, words are ordered as subject, verb, and object. When words are not correctly arranged they tend to lose their meanings.
Therefore, the correct option is syntax.
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