不知道你什么年级
所以不太好说
在过去式
http://baike.baidu.com/view/901109.htm
He didn't have lunch./He had lunch.
在过去完成时
http://baike.baidu.com/view/201153.html?wtp=tt
Mr. Smith died yesterday. He had been a good friend of mine.
在将来时
He will have lunch at 8:00.
一般性,在一般现在时中,都是要改成has的(实意动词)
当然,have 的意思很多,还有很多短语。
have 不做实意动词的时候就不用改了
I/They have a book.
He/She has a book.