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I could buy my ticket after queuing for half an hour. ()

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Code-switching refers to the fact that a speaker changes from one language to the other in different situations or when talking about different topics. ()

Linguists attempt to discover the universals of human language. ()

Phrase structure rules are rules that specify the constituents of syntactic categories. ()

The Rocky Mountains form. the most important river divide in the States, separating the system of the Mexican gulf and the system of the Pacific. ()

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