This paper shows that the Mandarin sentence-final particle ba lexically encodes specific illocutionary forces, which allow ba-tagged sentences to perform specific speech acts. To account for the fact about ba, it is argued that a speech act layer (cf. Haegeman and Hill, 2013; Hill, 2007; Ross, 1970; Speas and Tenny, 2003) projected by a functional head carrying a speaker-related feature is needed in the syntax. The paper also shows that ba is restricted in root environments in the sense of Emonds (1970), which indicates that functional heads encoding specific illocutionary forces cannot be embedded, and proves that the root versus non-root distinction proposed by Emonds (1970) is real despite all the counterexamples from English pointed out by Hopper and Thompson (1973) to reject the distinction.
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