虚拟语气用wish和wished有什么区别?

Question

下列虚拟语气句中的wish和wished所引导的句子，它们的意思表达有什么区别？

原形wish 例句：
I wish I had told her the truth yesterday.
（我真希望我昨天向她说了真话。）

过去式wished 例句：
At that time I wished I were a doctor.
（当时我真希望我是一个医师。）
He wished he had learned Chinese before he came to China.
（他希望他来中国之前先学了中文就好了。）

Answer 1

wish是现在希望
wished是过去希望

I wish I had told her the truth yesterday.我现在希望昨天做某事，从句用过去完成时，表示对过去动作的虚拟假设。

At that time I wished I were a doctor.这个是那时希望，那时是个医生。是在同一个时间表示希望，用一般过去时表示当时的希望。
（当时我真希望我是一个医师。）
He wished he had learned Chinese before he came to China.这个是过去希望，在过去的过去能好学中文。
（他希望他来中国之前先学了中文就好了。）

Answer 2

当wish 变成过去时态时，它后面的句子与wish是一般现在时的变化是一样的。如：
I wish I were a bird. I wished I were a bird.
I wish I had told her the truth yesterday. I wished I had told her the truth the day before.