did和has，這兩個單詞既是助動詞也是實義動詞，它們的區別是：意思不同，時態不 同，人稱不同。
作爲實義動詞
did表示一般過去時態的第一，二，三人稱單複數的“做”
例句：
He did dishes last evening.
has 表示一般現在時態的第三人稱的“有”
例句：Tom has a bike.
作爲助動詞，did用於輔助構成一般過去時態的所有人稱的單複數的否定句和疑問句
例句：
Did you have lunch at school?
Did you have a good meal? 你吃得好嗎
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作爲助動詞，只用於構成第三人稱的現在完成時態的句子。
例句：
It has rained for five hours. 雨已經下了5個小時了
He has been to Beijing.
She has watered the flowers. 她已經澆了花。
He has waited for her for two hours. 他等她已經兩個小時了
Has he seen the film
