对主语the girls提问:Who is running on the playground now?
对谓语are running提问:What are the girls doing on the playground now?
对地点状语on the playground提问:Where are the girls running now?
变特殊疑问句的规律是将被提问的部分换成疑问词
（what,where,when,who,why,how...)放在句首再将剩下的部分变为一般疑问句.当然你要先掌握一般疑问句的变法.