You do have a bad cold.这句话中是否多了单词do?

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• You do have a bad cold.这句话中是否多了单词do?
• You do have a bad cold.这句话中是否多了单词do?
• 一些简单的初中语法疑惑,Do you ever practice conversations with friends?.一．〕（1）Do you ever practice conversations with friends?这句话中,”ever”意思是”曾经”,那么为什么句首的是”Do”而不是 " Did”呢?（2）Have you ever practiced conversation with friends?这句话和上一句意思一样吧?为什么这句是现在完成时而上一句是一般现在时呢?（3）这两句的区别?〔可答可不答〕二．〕"is a good way to do sth"中,形容词"good"可以换成"great"吗?还可以换成什么?希望能稍微详细．清楚一些,＊＾－＾＊还有一个问题．I have problems/trouble Ving sth.这句中，problems/trouble 后为什么是Ving呢？
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• 1.Do you have a bad cold =Do you ____a bad cold