if i have和if i had的用法

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if i have和if i had的用法
举多点例子，要明显说出区别。

【1】 have/had 表示拥有
if i have 则是“如果我拥有”
例子：
if i have time now.如果我现在有时间
if i have a car.如果我有辆车
if i had 则是过去式 “如果我当时拥有”
例子：
if i had a hammer 如果我当时有个锤子
【2】 have/had 作为时态
if i have done 如果我已经完成
例子：
if i have finished my homework.如果我已经完成作业.
表示的是没有完成作业这件事对【现在】的影响.
if i had done 如果我过去已经完成
if i had finished my homework.如果我当时是完成了作业.
表示的是没有完成作业这件事对【过去】产生了影响.

if i have和if i had的用法 if I have 和If I had的区别 if I saw you, I had remembered you.和if I saw you, I had have If I had to和If I have to的区别 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 he would have if i had asked If I had known that,I could have helped you.had和known怎么都是过去式 if i had my If.I.Had.You If i had studied if i had. i would have这是什么语法? if i had worked hard,i would have succeed