Homophones are words of the same language that are pronounced alike even if they differ in spelling, meaning, or origin, such as "pair" and "pear". Homophones may also be spelled alike, as in "bear" (the animal) and "bear" (to carry). But this list consists only of homophones that are not spelled alike.
In the Internet Grammar of English, we use the term grammar to mean the system of structural rules which describes how words combine with each other to form sentences. In this sense, native speakers of English already have an instinctive knowledge of its grammar. It is this knowledge which enables us to distinguish a well-formed English sentence from one which is clearly ill-formed.
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