In Diu Indo-Portuguese, interrogative phrases immediately precede the verb group (including close-knit verb phrase modifiers, such as preverbal Tense-Aspect markers or clausal negators), i.e. they occur in preverbal focus position. Therefore, they are not by definition clause-initial, and only occur in that position in the elliptic absence of any potentially preceding constituents such as the subject or various adjuncts.
Very rarely, elements normally occurring in clause-initial position (e.g. subjects, adverbials) are displaced to postverbal position so that the interrogative phrase appears initially; this is by no means the default strategy and, at any rate, it never challenges the rule that interrogative phrases occupy the preverbal focus position.
Source: Cardoso 2009: 202
Source: Cardoso 2004-2008
Source: Cardoso 2009: 203