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allowed to pass freely through the resonators, the sound is a vowel。 ? if the air, once out of the glottis, is obstructed, partially or totally, in one or more places, the sound is a consonant. 幾個(gè)重要的語(yǔ)言學(xué)家及其理論 ? 1. The publication of Course in General Linguistics (1916) by Swiss linguist Ferdinand de Saussure marked the beginning of modern linguistics. Therefore, Saussure is hailed as “ father of modern linguistics” . ? ? 2. Transformational Generative Grammar is initiated by US linguist Noam Chomsky, which proposes that below the actual phrases and sentences of a language (surface structure) there lies a more basic layer (deep structure) and which attempts to describe a native speaker’ s tacit grammatical knowledge by a system of rules that in an explicit and welldefined way specify all of the wellformed or grammatical sentences of language while excluding all ungrammatical or impossible sentences. ? 3. Stemming from Firth’ s theories in the London School, Halliday’ s SystematicFunctional Grammar is a socially oriented functional linguistic approach and one of the most influential linguistic theories in the 20th century. Systematic Grammar aims to explain the internal relations in language and Functional Grammar aims to reveal that language is means of social interaction.