have和eat的区别：意思不同、用法不同。have可作及物动词和助动词，基本含义有占有、由……组成、显示出、带有……性质，常与过去分词连用构成完成时；eat只作动词，含义有吃、用餐。
一、have的基本含义及用法介绍
have可作及物动词和助动词，含义有有;持有;占有;由…组成;显示出，带有(性质、特征)；与过去分词连用构成完成时。
例句：This is too big ─ have you got a small one?
这个太大——有没有小的？
The two groups of children have quite different characteristics.
这两组儿童具有截然不同的特点。
There have been many changes in recent years.
近几年发生了许多变化。
No new SARS cases have been reported in the region.
该区没有新增非典型肺炎病例。
He has carried out extensive research into renewable energy sources.
他已经对再生能源进行了广泛研究。
We had no say in the decision to sell the company.
在决定出售公司的问题上，我们没有发言权。
We had relatively few applications for the job.
申请我们这项工作的人相对较少。
The situation has changed somewhat since we last met.
自我们上次见面以来情况有些变化。
二、eat的基本含义及用法介绍
eat作为动词，意为吃;吃饭;用餐。
例句：I eat lots less than I used to.
我比以前吃得少多了。
I could just eat a little something.
我只能吃一点点东西。
She'll have them eating out of her hand in no time.
她很快就会让他们俯首帖耳的。
You'll get fat if you eat so much chocolate.
你如果吃这么多巧克力就会发胖的。
He'd eat chocolate all day long if I let him.
我要是不拦着，他会整天不停地吃巧克力。
They ate everything that was set in front of them.
他们把放在面前的东西都吃光了。
