Asymmetry of the Modal Verbs"Xing(行)"and"Keyi(可以)"
There are phenomena of semantic intersection and pragmatic interpenetration between the modern Chinese modal verbs"xing(行)"and"keyi(可以)".The verb"xing(行)"has moral and motivational modal meanings,while"keyi(可 以)"has three modal meanings:moral,motivational and semantic.The affirmative and negative forms of"xing(行)"and"keyi(可以)"are asymmetrical in form and semantics.The formal asymmetry is mainly caused by the difference in semantic degree.The power modal"keyi2x(可以 2x)",which has a very high semantic degree,can only be negated by the negative form"buneng(不能)"of the power modal"neng(能)",which has a lower semantic degree.The moral modal"xing1(行 1)""keyi1(可以 1)"and the motivational modal"xing2(行 2)""keyi2y(可以 2y)"can be negated by adding"bu(不)"directly in front of them to a moderate degree of semantics.In addition,due to the influence of metrical and communicative effort,"keyi1(可以 1)"can be negated by"buxing(不行)".
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