Lingua franca was originally used in Mediterranean commerce in the Middle Ages. ()
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In reality, two linguistic forms can be identical. ()
Inflectional morpheme may be a free morpheme. ()
At the sentential level, the comprehension of a sentence is realised through extracting the syntactic and semantic information of the sentence, interpreting the sentential meaning in the light of its contexts, and retaining some or all of the interpr ()
Duality is a concretisation of arbitrariness and non-arbitrariness of language. ()