一、don't have中have是实义动词,意思是“有,吃,玩”等,常用在一般现在时态的句子中。例句,
I don't have a brother in my family.我在家里也没有哥哥或弟弟。
He doesn't have breakfast every day. 每天他都不吃早餐。
二、haven't在have是助动词,没有实际意义,常用在现在完成时态中与动词过去分词共同作谓语。例句,
I haven't finished my homework yet.我还没完成作业哩。
We haven't had lunch.我还没吃午饭。
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