I have had enough.这个句中的had 在这是什么意思？
是have的过去分词，这话意为“我已经有足够的了”
have + 动词的过去分词 是现在完成时的结构
sure enough什么意思
释义
果然; 的的确确
例句：
1.He said he would come, and sure enough he came.
他说过要来, 果然,他来了.
2.
He will come sure enough.
他必来无疑.
3.
We found the English treacle pudding too good to resist. Sure enough, it was delicious.
我们觉得英国糖蜜布丁太好吃了，令人无法抗拒。的确非常美味。
have had done是什么结构
整个句子的时态不确定，表面看起来像一般过去式（你这句子貌似有点问题。。应该是He is/was/has been said to have had his car lost，整个句子时态由前面的be动词决定）
但后半部分“have had his car lost”是现在完成时。。。
have his car lost他车丢了，动词是have
嵌套进现在完成时have done结构，动词have变为had，于是变成了have had his car lost..
这个句子里同时有has had，是怎么回事. 作什么成分
has 是现在完成时借助的助动词have 的第三人称单数，have /has /had done sth
had 是谓语动词have 的过去分词形式（代替上面的done )
have no importance没有重要性，即不重要
has had no importance 已经不重要了
翻译：个人自由的观念在人类历史的大部分文化中已经不重要了！