didyou问句后的动词为什么要用原型?
如果说是助动词要用原型的话,have为什么用过去式?
例子:Ihavedonemywork.
Hehasbeenworkingallday.
Bythattimealltheguestshadarrived.
如果说did代替了动词的过去式表达方式了话,have也是一样,动词却还是过去式.