帮忙看英语句子 I wish I was dead.对吗？

一般语法书说(或多数考试题目要求)，只有下列结构才算正确：
I wish I were；I wish he were
例句：
I wish I were a billionaire.
但愿我是个亿万富豪。
不过，西方人也说：
I wish I was a billionaire.
另外，Jack London在其小说Martin Eden中写道：
He wished Ruth was there to share in the joy.
Jack London无理由写错。若仍不信，只好搬出字典来：
牛津高阶英汉双解词典》第六版说：
[V (that)] I wish I were taller. 我要是个子高一些就好了。◇ (BrE also) I wish I was taller.
陆谷孙《英汉大词典》则说：
[表示不能实现或与现实相悖的愿望] 但愿：I ～ I were (或was) a bird. 我愿自已是只鸟。
至于原因，牛津字典说I wish I were...结构是英式英文的一种选择，但亦有学者称其属spoken English。
所引美国作家Jack London的句子，在书中不属对话，即非spoken English，那么，他到底是用哪种英文写作的，英式还是美式？
我们不必深究，明白I wish I was...结构不算错即可。

were 绝对没错
但生活中经常说was的，没那么严格

你说得对,要用were,

I wish I were as tall as you. 我希望和你一样高。
He wished he hadn't said that. 他希望他没讲那样的话。
I wish it would rain tomorrow. 我希望明天下雨就好了。

鬼老说这个时也遵守这个习惯的
If I were you, I would ....

你的感觉是对的，95% 的虚拟语气中的be都是用的 were ,但是 was 也是正确的，这个通常出现在非正式的口语中