【答案解析】略

【答案解析】The distinctive feature refers to a property which distinguishes one phoneme from another. For example, "voicing" is a distinctive feature, since it plays an important role in distinguishing obstruents in English.

【答案解析】Linguistic variables are those where the meaning remains constant but form varies like cat and pussy have the same social meaning but different forms. So far as pronunciation is concerned house [h] and with [h] has same social meaning with different pronunciations. Here variables are just the tools to analyze the language to set social dimensional society.

【答案解析】It is a language that is used for communication between different groups of people, each speaking a different language. The lingua franca could be an internationally used language of communication (e. g. English), it could be the native language of one of the groups, or it could be a language which is not spoken natively by any of the groups but has a simplified sentence structure and vocabulary and is often a mixture of two or more languages.