關於英文文法的問題?

"subjunctive" is a verb form or a set of verb forms in Grammar, used to express wishes etc. eg:-the verb "to be" is in the subjunctive
eg:-if I were a bird
=if I were "to be" a bird
=passive voice
="to be"=were
=Were I a bird
=Were I a bird, I would fly.
=indicating cannot be a fact, only imagining imperatively.

句1 OK, 與事實相反的假設語氣, 表達願望, 也可倒裝成 Were I a bird, I would fly.
句2 文法沒錯但不合邏輯, 這句法是用來表示可能發生的情況, 有點以退為進的味道, 例如:
If I were to bite your head off for asking a stupid question, I could get cited for discourtesy.
(如果我罵你問笨問題, 可能會因無禮而被記上一筆。)

If I were a bird,I would fly: 如果我是一隻鳥，我就能飛(比喻不可能的事實，假想狀態)
If I were to be a bird,I would fly: 如果我是一隻鳥，我就能飛(比喻有可能可以做到，做到的話就能夠飛)
翻譯意思都一樣，但是想法不同。

1.If I were a bird,I would fly.
2.If I were to be a bird,I would fly.
這2句差在哪裡呢？
文法上兩句不會有問題，但就句意上(我是一隻鳥，是與現在事實相反，且完全無任何發生可能，故句2的寫法4個老外3個認為為不必要或錯誤 – 1位老外認為2句皆可 – 但也是勉強的可以,且他的意見也招到反對質疑,但因他提供以下解說Link,所以我給他最佳解答) – 以上資料為英文Yahoo 知識網發問所得

最後叁考五位老外的意見(不含一位亂寫答案的老外)，我相信2句的寫法為錯誤(文法與句意不合) - 不能翻譯
Were to 的詳細用法如下link 及 copy
https://www.englishpage.com/conditional/wereto.html
Were To
"Were to" in the Present
FORM
[If ... were to + verb ..., ...]
USE
"Were to" can be used in the present to emphasize that the conditional form is extremely unlikely or unthinkably horrible. Notice that this special form is only used in the if-clause.
Examples:
• If she were to be rich, she would be horribly obnoxious.
It is very unlikely that she would be rich.
• If I were to have no friends, who would I spend my time with?
Having no friends is a horrible thought.
• If Nathan were to be my boss, this job would be intolerable.
Nathan's being my boss is a horrible concept.
"Were to" in the Future
FORM
[If ... were to + verb ..., ...]
USE
"Were to" can be used in the future to emphasize that the conditional form is extremely unlikely or unthinkably horrible. Notice that this special form is only used in the if-clause.
Examples:
• If I were to lose my job next year, I would probably not find a new one quickly.
Loosing my job would be terrible.
• If he were to fail his driving test tomorrow, he would have to take it again.
He is not likely to fail his driving test.
• If Sarah were to show up late to the birthday party, it would ruin the surprise.
Sarah will surely come on time.
"Were to" in the Past
FORM
[If ... were to have + past participle ..., ...]
USE
"Were to" can be used in the past to emphasize that the conditional form is extremely unlikely or unthinkably horrible. Notice that this special form is only used in the if-clause.
Examples:
• If the fire were to have destroyed the building, it would have been a tragic cultural loss.
The thought of such a loss is too horrible to consider.
• If the dam were to have burst, the entire town would have been destroyed.
Such destruction is too horrible to consider.
• If Sarah were to have failed the final test, she would have lost her scholarship.
She is an excellent student, and it is very unlikely that she would have failed the test.