did和has，这两个单词既是助动词也是实义动词，它们的区别是：意思不同，时态不 同，人称不同。
作为实义动词
did表示一般过去时态的第一，二，三人称单复数的“做”
例句：
He did dishes last evening.
has 表示一般现在时态的第三人称的“有”
例句：Tom has a bike.
作为助动词，did用于辅助构成一般过去时态的所有人称的单复数的否定句和疑问句
例句：
Did you have lunch at school?
Did you have a good meal? 你吃得好吗
Did your sister go to the park by bus?
I did not go to Shanghai last sunday.
Mike did not do homework last week.
has作为助动词，只用于构成第三人称的现在完成时态的句子。
例句：
It has rained for five hours. 雨已经下了5个小时了
He has been to Beijing.
She has watered the flowers. 她已经浇了花。
He has waited for her for two hours. 他等她已经两个小时了
Has he seen the film
