This paper gives a detailed analysis of the pragmatic functions of WH-cleft sentence, which is usually considered as containing two components: Given/New or Presupposition/Focus.

An Empirical Study of Chinese Learners' Learnability and Acquisition of Wh-questions

To begin with, it provides a critical review of the important issues concerning the interpretation of wh-phrases in multiple wh-phrases in English, such as pair-list answer, the semantic features of the first wh-phrase (D-linked and referentially dependent), the compatibility of multiple wh-question and the quantification of wh-phrase and universal quantifier, etc.