3、 has been ill for three days.变为一般疑问句。HasMarybeenillforthreedays?Yes,shehas.They have lived here since theywere born.变为一般疑问句。Havetheylived here since theywere born?No,theyhaven’t.二、现在完成时的结构3、一般疑问句结构:Have/Has……done?Hehasdonehishomeworkfor3hours.对划线部分进行提问。Ho