have和having的区别和用法：含义不同、用法不同。have可作动词和助动词，含义为持有、由……组成、显示出等，常与过去分词连用构成完成时；having只作动词，含义为有、显示出、带有等，一般用于系动词或介词之后。
一、have的含义及用法介绍
1、作为动词，意为有;持有;占有;由…组成;显示出，带有(性质、特征)。
例句：He had a new car and a boat.
他有一辆新车和一条船。
In 1999 the party had 10 000 members.
这个党在1999年时拥有1万名党员。
The ham had a smoky flavour.
这火腿散发着一种烟熏的香味。
Surely she didn't have the nerve to say that to him?
她一定没有胆量跟他这样说吧？
I went to a few parties and had a good time.
我参加了几次聚会，过得很愉快。
2、作为助动词，与过去分词连用构成完成时。
例句：I've finished my work.
我干完我的活儿了。
Had they left before you got there?
你到那里时他们已经离开了吗？
If I hadn't seen it with my own eyes I wouldn't have believed it.
要不是亲眼看见了，我不会相信的。
二、having的含义及用法介绍
having作为动词，是have的现在分词，意为有;持有;占有;由…组成;显示出，带有(性质、特征)。
例句：Our son's having problems with his reading and writing.
我们儿子在读写方面有困难。
I'm having treatment for my back problem.
我正接受背部疾患的治疗。
Few people can count on having a job for life.
几乎没有人能指望一辈子都干一个工作。
