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has是have的第三人称单数形式。have作动词有“持有；占有；由……组成；显示出，带有(性质、特征)”的意思，作助动词与过去分词连用构成完成时。另外have的现在分词是having，过去式是had，过去分词是had。
have的基本用法
一、have作实意动词
1.表示“有”的意思。
I have an English book.
He has two ping-pong bats.
2.have和一些其他名词连用，表示：
(1)一种活动。
They’re going to have a volleyball match.(举行比赛)
Are we going to have a meeting this week?(开会)
We are going to have a talk this afternoon.(谈话)
(2)患病。
I have got a headache.
I have a bad cold.
(3)发生的情况。
I’ve had so many falls that I’m black and blue all over.
(4)生育。
The queen ant may have tens of thousands of babies in one summer.
3.和一个与动词同形的名词连用，表示一个动作(have+a+与动词同形的名词)。
Are you going to have a swim.
I have a long talk with the teacher.
4.have on sth.或have sth.on表示“穿着”、“戴着”(=to be wearing)。
I noticed he had on bedroom slippers.
At the ball，Mary had a diamond necklace on.
5.表示“吃”、“喝”。
I wanted to have a cup of tea and some eggs.
Does she have lunch at home?
二、have与to一起构成情态动词，表示“不得不”、“必须”。
I have to be back by ten o’clock.
I have to look after her at home.
Do you have to look after her at home?
三、have作助动词与动词的过去分词一起构成现在完成时和过去完成时。
Great changes have taken place the last two years.
Have great changes taken place the last two years?