Have可以作为实义动词，表示“有”的意思，表示“吃，喝，活动”，表示“让”，表示“不得不”；也可以作为助动词，Have / has + 过去分词可以构成现在完成时；还能用作情态动词，与 better 构成：had better 情态动词。 一、have为实义动词时 1）表示“有”。 I have a new house. She has a blue computer. 句型: have sth to do My sister has many things to do athome.
2）表示“吃、喝”。 Please have a cup of tea. The students have lunch at schooleveryday.
3）表示“患病”。 The woman had a fever yesterday. The baby has a cough.
4）表示“穿着、戴着”。 have on sth 或have sth on，(=to be wearing) He had on his new shoes. The little girl has his hat on.
5）表示“从事、进行”活动等。 have a meeting开会 have a walk散步 have a talk 谈话 have a party举行派对 have a rest/break休息 have a look (at)看一看 have a match 举行比赛 have a swim游泳 have classes/lessons 上课 have a try试一试 have a trip旅行
6）注意have的常见搭配。 have to不得不 have fun玩得高兴 have a good time祝过得愉快 have a good day祝今天过得愉快 had better do sth最好做某事 have a word(a few words)with sb和某人说一（几）句话 have nothing/something to do with “和…无(有)关系”
二、have为助动词时 1）与过去分词构成各种完成时态。如： I have read the book. 我读过这本书。
2）构成have got词组，这是口语中常用的have的形式。如： I have got two sisters. 我有两个姐姐。
3）have+been +过去分词，构成完成式被动语态，例如： I have been washing the clothes the whole morning. 整个上午我都在洗衣服。
三、have为情态动词时 1）Have to的定义：表示客观需要做的事情，意为“必须，不得不”。
2）Have to 用法：have to+v原形“必须做……/不得不做……”。
3）have to 人称，数和时态变化：have to 有人称，数和时态的变化，第三人称单数用has to。
4）Have to 的疑问句和否定句:含有have to和has to的句子借助助动词do/does构成疑问句和否定句。