陈述句变特殊疑问句,有be动词的把be 动词提前,没有be动词的要加助动词 do/ did/ has/ had 的.

has/ had也是助动词啊？当它们用在现在完成时和过去完成时中的时候是助动词。have done sth 例如：How many times have you been to America?has done sth 例如： How many times has she been to America?had done sth 例如： How many times had she been to America before she moved to America?