had的用法!i had be happy这句话什么意思?为什么要用have的过去式?

had的用法!i had be happy这句话什么意思?为什么要用have的过去式? 我拥有我快乐I'm happy because I have had it. 为什么要用过去式? 英语达人,I have had it several times,这句话里面的had是什么?我知道have过去式had, had better是“最好.还是”的 意思,had是have的过去式,这里为什么要用had,不要告诉我是规定噢. have had 的用法. what if的用法这里是不是跟虚拟语气就要用过去式?For example What if I have/had on 过去式的用法be动词的过去式或had后面的动词用原形还是动词过去式?举例! Had had的用法. "i hope she'd be very happy".这里的" 'd " 是had还是would?为什么? have与had的用法 为什么have的过去式是had而不是haved? if i have和if i had的用法