WH-questions usually by WH-fronting in a focus-type construction. Occasionally, WH-questions can be additionally introduced by the sentence-initial tag wala normally used in polar questions. R focusing in a dative construction is illustrated in (306f), where R is extracted together with a dative postposition as is usual in the PP-focus construction. p. 285. R can be questioned in a regular way from both dative construction (see (425a) and DOC (425b). As usual, in the former case dative postposition will be extracted together with R, in the latter R will be resumed by a resumptive pronoun. T can be normally questioned only from the dative construction (426a), questioning from the postverbal position in a Double Object construction is marginal (426b) is questionable. p. 286. SHOW has the same syntax as GIVE. An example of T questioning from a dative construction is (427a).
Source: Heath 1999: 229
Source: Heath 1999: 285
Source: Heath 1999: 285
Source: Heath 1999: 286