sentences:  The responses to these questions cannot be yes or no; they must be answered using informative phrases.Wh-items undergo Wh-movement to the specifier of CP, leaving a Wh-trace (tWH) in its original position.Just like for DP-movement, this movement is the result of feature checking, this time, to check the [+WH] feature in C. 
  
  To form a Wh-question in the example below, the DP [who] moves to the specifier of the CP position, leaving a Wh-trace in its original position.